/*
 * jQuery JavaScript Library v1.3.2
 * http://jquery.com/
 *
 * Copyright (c) 2009 John Resig
 * Dual licensed under the MIT and GPL licenses.
 * http://docs.jquery.com/License
 *
 * Date: 2009-02-19 17:34:21 -0500 (Thu, 19 Feb 2009)
 * Revision: 6246
 */
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this.options.curAnim){o.attr(this.elem.style,I,this.options.orig[I])}}this.options.complete.call(this.elem)}return false}else{var J=G-this.startTime;this.state=J/this.options.duration;this.pos=o.easing[this.options.easing||(o.easing.swing?"swing":"linear")](this.state,J,0,1,this.options.duration);this.now=this.start+((this.end-this.start)*this.pos);this.update()}return true}};o.extend(o.fx,{speeds:{slow:600,fast:200,_default:400},step:{opacity:function(E){o.attr(E.elem.style,"opacity",E.now)},_default:function(E){if(E.elem.style&&E.elem.style[E.prop]!=null){E.elem.style[E.prop]=E.now+E.unit}else{E.elem[E.prop]=E.now}}}});if(document.documentElement.getBoundingClientRect){o.fn.offset=function(){if(!this[0]){return{top:0,left:0}}if(this[0]===this[0].ownerDocument.body){return o.offset.bodyOffset(this[0])}var G=this[0].getBoundingClientRect(),J=this[0].ownerDocument,F=J.body,E=J.documentElement,L=E.clientTop||F.clientTop||0,K=E.clientLeft||F.clientLeft||0,I=G.top+(self.pageYOffset||o.boxModel&&E.scrollTop||F.scrollTop)-L,H=G.left+(self.pageXOffset||o.boxModel&&E.scrollLeft||F.scrollLeft)-K;return{top:I,left:H}}}else{o.fn.offset=function(){if(!this[0]){return{top:0,left:0}}if(this[0]===this[0].ownerDocument.body){return o.offset.bodyOffset(this[0])}o.offset.initialized||o.offset.initialize();var J=this[0],G=J.offsetParent,F=J,O=J.ownerDocument,M,H=O.documentElement,K=O.body,L=O.defaultView,E=L.getComputedStyle(J,null),N=J.offsetTop,I=J.offsetLeft;while((J=J.parentNode)&&J!==K&&J!==H){M=L.getComputedStyle(J,null);N-=J.scrollTop,I-=J.scrollLeft;if(J===G){N+=J.offsetTop,I+=J.offsetLeft;if(o.offset.doesNotAddBorder&&!(o.offset.doesAddBorderForTableAndCells&&/^t(able|d|h)$/i.test(J.tagName))){N+=parseInt(M.borderTopWidth,10)||0,I+=parseInt(M.borderLeftWidth,10)||0}F=G,G=J.offsetParent}if(o.offset.subtractsBorderForOverflowNotVisible&&M.overflow!=="visible"){N+=parseInt(M.borderTopWidth,10)||0,I+=parseInt(M.borderLeftWidth,10)||0}E=M}if(E.position==="relative"||E.position==="static"){N+=K.offsetTop,I+=K.offsetLeft}if(E.position==="fixed"){N+=Math.max(H.scrollTop,K.scrollTop),I+=Math.max(H.scrollLeft,K.scrollLeft)}return{top:N,left:I}}}o.offset={initialize:function(){if(this.initialized){return}var L=document.body,F=document.createElement("div"),H,G,N,I,M,E,J=L.style.marginTop,K='<div style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"><div></div></div><table style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;" cellpadding="0" cellspacing="0"><tr><td></td></tr></table>';M={position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"};for(E in M){F.style[E]=M[E]}F.innerHTML=K;L.insertBefore(F,L.firstChild);H=F.firstChild,G=H.firstChild,I=H.nextSibling.firstChild.firstChild;this.doesNotAddBorder=(G.offsetTop!==5);this.doesAddBorderForTableAndCells=(I.offsetTop===5);H.style.overflow="hidden",H.style.position="relative";this.subtractsBorderForOverflowNotVisible=(G.offsetTop===-5);L.style.marginTop="1px";this.doesNotIncludeMarginInBodyOffset=(L.offsetTop===0);L.style.marginTop=J;L.removeChild(F);this.initialized=true},bodyOffset:function(E){o.offset.initialized||o.offset.initialize();var G=E.offsetTop,F=E.offsetLeft;if(o.offset.doesNotIncludeMarginInBodyOffset){G+=parseInt(o.curCSS(E,"marginTop",true),10)||0,F+=parseInt(o.curCSS(E,"marginLeft",true),10)||0}return{top:G,left:F}}};o.fn.extend({position:function(){var I=0,H=0,F;if(this[0]){var G=this.offsetParent(),J=this.offset(),E=/^body|html$/i.test(G[0].tagName)?{top:0,left:0}:G.offset();J.top-=j(this,"marginTop");J.left-=j(this,"marginLeft");E.top+=j(G,"borderTopWidth");E.left+=j(G,"borderLeftWidth");F={top:J.top-E.top,left:J.left-E.left}}return F},offsetParent:function(){var E=this[0].offsetParent||document.body;while(E&&(!/^body|html$/i.test(E.tagName)&&o.css(E,"position")=="static")){E=E.offsetParent}return o(E)}});o.each(["Left","Top"],function(F,E){var G="scroll"+E;o.fn[G]=function(H){if(!this[0]){return null}return H!==g?this.each(function(){this==l||this==document?l.scrollTo(!F?H:o(l).scrollLeft(),F?H:o(l).scrollTop()):this[G]=H}):this[0]==l||this[0]==document?self[F?"pageYOffset":"pageXOffset"]||o.boxModel&&document.documentElement[G]||document.body[G]:this[0][G]}});o.each(["Height","Width"],function(I,G){var E=I?"Left":"Top",H=I?"Right":"Bottom",F=G.toLowerCase();o.fn["inner"+G]=function(){return this[0]?o.css(this[0],F,false,"padding"):null};o.fn["outer"+G]=function(K){return this[0]?o.css(this[0],F,false,K?"margin":"border"):null};var J=G.toLowerCase();o.fn[J]=function(K){return this[0]==l?document.compatMode=="CSS1Compat"&&document.documentElement["client"+G]||document.body["client"+G]:this[0]==document?Math.max(document.documentElement["client"+G],document.body["scroll"+G],document.documentElement["scroll"+G],document.body["offset"+G],document.documentElement["offset"+G]):K===g?(this.length?o.css(this[0],J):null):this.css(J,typeof K==="string"?K:K+"px")}})})();// get the left offset of an object w.r.t. the total page
function getLeftOffset(obj) 
{
	var leftpos = 0;
	if (obj.offsetParent) 
  {
		leftpos = obj.offsetLeft;
		while (obj = obj.offsetParent) 
    {
			leftpos += obj.offsetLeft;
		}
	}
	return leftpos;
}

// get the top offset of an object w.r.t. the total page
function getTopOffset(obj) 
{
	var toppos = 0;
	if (obj.offsetParent) 
  {
		toppos = obj.offsetTop;
		while (obj = obj.offsetParent) 
    {
			toppos += obj.offsetTop;
		}
	}
	return toppos;
}

// get the value of a given style attribute
function getStyle(el,styleProp)
{
	var x = document.getElementById(el);
	if (x.currentStyle)
		var y = x.currentStyle[styleProp];
	else if (window.getComputedStyle)
		var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);
	return y;
}


// Read a page's GET URL variables and return them as an associative array (source snipplr.com)
function getUrlVars()
{
  var vars = [], hash;
  var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
       
  for(var i = 0; i < hashes.length; i++)
  {
    hash = hashes[i].split('=');
    vars.push(hash[0]);
    vars[hash[0]] = hash[1];
  }    
  return vars;
}

// get all elements of a given class 
document.getElementsByClassName = function(cl) {
var retnode = [];
var myclass = new RegExp('\\b'+cl+'\\b');
var elem = this.getElementsByTagName('*');
for (var i = 0; i < elem.length; i++) {
var classes = elem[i].className;
if (myclass.test(classes)) retnode.push(elem[i]);
}
return retnode;
};

// same as function above only this one works for ie6 on arbitrary elements
function getElementsByClassName(cl,el) {
var retnode = [];
var myclass = new RegExp('\\b'+cl+'\\b');
var elem = el.getElementsByTagName('*');
for (var i = 0; i < elem.length; i++) {
var classes = elem[i].className;
if (myclass.test(classes)) retnode.push(elem[i]);
}
return retnode;
}

// function to switch the image source of a image
function change_img_src(id, file)
{
  var image = document.getElementById(id);
  if(image)
  {
    // in case of IE < than version 7 switch the source of the AlphaImageLoader
	  if(browser.isIE && browser.version >= 5.5 && browser.version < 7)
	    image.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = file; 		 
    else
      image.src = file;
  }
}

// function to scroll a given (div-) element into view
function scroll_into_view(id)
{
  if(browser.isIE)
    document.getElementById(id).scrollIntoView(false);
  else
    document.getElementById(id).scrollIntoView(true);

  return false;
}

// function to place a given (div-) element to the top of the visible content area
function place_at_top(target_id)
{
  var obj = document.getElementById(target_id);
  //reset top margin
  obj.style.marginTop = '0px';
  // get page offset
  var y = getTopOffset(obj); 

  if(browser.isSA)
  {
    // for Safari browser
    var scroll_y = document.body.scrollTop;
  }
  else
  {
    // this works for firefox and ie6 and ie7
    var scroll_y = document.documentElement.scrollTop;
  }

  var margin_top = scroll_y - y;
  if(margin_top < 0)
    margin_top = 0;

  obj.style.marginTop = margin_top +'px';

  return false;
}

// the common trim function for javascript
function trim(value) 
{
  value = value.replace(/^\s+/,'');
  value = value.replace(/\s+$/,'');
  return value;
}

// convert background color string like rgb(255,255,255,) to a hexadecimal string like ffffff
// or a hexadecimal string to an array [{red},{green},{blue},{grey}] with values between 0 and 255 
function rgbConvert(str) 
{
  if(str.substr(0,3)=='rgb')
  {
    str = str.replace(/rgb\(|\)/g, "").split(",");
    str[0] = parseInt(str[0], 10).toString(16).toLowerCase();
    str[1] = parseInt(str[1], 10).toString(16).toLowerCase();
    str[2] = parseInt(str[2], 10).toString(16).toLowerCase();
    str[0] = (str[0].length == 1) ? '0' + str[0] : str[0];
    str[1] = (str[1].length == 1) ? '0' + str[1] : str[1];
    str[2] = (str[2].length == 1) ? '0' + str[2] : str[2];
    return (str.join(""));
  }
  else if(str.length == 6)
  {
    var rgb = new Array();
    rgb[0] = parseInt(str.substr(0,2),16);
    rgb[1] = parseInt(str.substr(2,2),16);
    rgb[2] = parseInt(str.substr(4,2),16);
    rgb[3] = (rgb[0]+rgb[1]+rgb[2])/3;
    return rgb;
  }
  return str; 
}

function addslashes( str ) {
    // Escapes single quote, double quotes and backslash characters in a string with backslashes  
    // 
    // version: 810.114
    // discuss at: http://phpjs.org/functions/addslashes
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Ates Goral (http://magnetiq.com)
    // +   improved by: marrtins
    // +   improved by: Nate
    // +   improved by: Onno Marsman
    // *     example 1: addslashes("kevin's birthday");
    // *     returns 1: 'kevin\'s birthday'
 
    return (str+'').replace(/([\\"'])/g, "\\$1").replace(/\0/g, "\\0");
}

function stripslashes( str ) {
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Ates Goral (http://magnetiq.com)
    // +      fixed by: Mick@el
    // +   improved by: marrtins
    // +   bugfixed by: Onno Marsman
    // +   improved by: rezna
    // +   input by: Rick Waldron
    // +   reimplemented by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: stripslashes('Kevin\'s code');
    // *     returns 1: "Kevin's code"
    // *     example 2: stripslashes('Kevin\\\'s code');
    // *     returns 2: "Kevin\'s code"
    return (str+'').replace(/\\(.?)/g, function (s, n1) {
        switch(n1) {
            case '\\':
                return '\\';
            case '0':
                return '\0';
            case '':
                return '';
            default:
                return n1;
        }
    });
}




/* Javascript  for browser detection */

//----------------------------------------------------------------
// browser detection 
//----------------------------------------------------------------

var browser = null;

function Browser() {

  var ua, s;

  this.isFF    = false;  // Firefox
  this.isIE    = false;  // Internet Explorer
  this.isOP    = false;  // Opera
  this.isNS    = false;  // Netscape
  this.version = null;

  ua = navigator.userAgent;

	//--------------------------------
	// detecting Firefox
	s="Firefox";
	if(navigator.userAgent.indexOf(s)!=-1)
	{
	  this.isFF = true;
		
		// determine version
    var versionindex=ua.indexOf(s)+ s.length;
    this.version= parseFloat(ua.substr(versionindex)) 

    return;
  }
	
	//--------------------------------
	// detecting Internet Explorer
	s="MSIE";
	if(navigator.userAgent.indexOf(s)!=-1)
	{
	  this.isIE = true;
		
		// determine version
    var versionindex=ua.indexOf(s)+ s.length;
    this.version= parseFloat(ua.substr(versionindex))  

    return;
  }

	//--------------------------------
	// detecting Opera
	s="Opera";
	if(navigator.userAgent.indexOf(s)!=-1)
	{
	  this.isOP = true;
		
		// determine version
    var versionindex=ua.indexOf(s)+ s.length;
    this.version= parseFloat(ua.substr(versionindex)) 

    return;
  }

	//--------------------------------
	// detecting Netscape
	s="Netscape/";
	if(navigator.userAgent.indexOf(s)!=-1)
	{
	  this.isNS = true;
		
		// determine version
    var versionindex=ua.indexOf(s)+ s.length;
    this.version= parseFloat(ua.substr(versionindex)) 

    return;
  }	

	//--------------------------------
  // Treat any other "Gecko" browser as Netscape 6.1.
  s="Gecko";
	if(navigator.userAgent.indexOf(s)!=-1)
	{
	  this.isNS = true;
		
    this.version= 6.1;

    return;
  }	

}

// set global variable
browser = new Browser();


var bodyWidth;
var backgroundImage;


function centerBackground(image)
{
  
	// get width and height of body
	bodyWidth = document.body.clientWidth;
		
	// center background according to image size
  image.style.left = (bodyWidth - image.offsetWidth)/2;
			
}

var nr_g_frames = 24;
var g_animator = null;
var g_frames = new Array();

//$(document).ready(function(){animate_header();});
$(window).load(function(){animate_header();});

function animate_header()
{
  // make the header images fly in to a random position
  var h_images = $("#page_header img.headerimg");
  var distance = 500;
  for(var i=0; i<h_images.size(); i++)
  {
     // create random position shift between 300 and 700
     distance = 300 + Math.round(Math.random()*400);

     h_images.eq(i).animate({left: '-='+distance+'px'}, (8*distance), 'swing');
  }

  // make the header title fade in and decrease letter-spacing
  $("#header_title").animate({letterSpacing: 8, opacity: 1.0}, 4000,'swing');
  $("#header_title_shadow").animate({letterSpacing: 8, opacity: 0.6}, 4000,'swing');

  // initialize the G-logo animation (not supported for IE<7)
  if(!(browser.isIE && browser.version < 7))
    init_gAnimate();

}

function init_gAnimate()
{
		g_animator = document.getElementById("g_animator");
 
    // load frames
    var nr;
 		for(i=0; i<nr_g_frames; i++)
		{		
      k=i+1;	
		  if(k<10)
			  nr = "0"+k;
			else
			  nr = k;
				
			g_frames[i] = new Image();
			g_frames[i].src = "images/G_frames/frames04/00" + nr + ".png";			
		}

    // start animation
    gAnimate(0);

}

function gAnimate(frame)
{
 	 // switch frame image source
   g_animator.src = g_frames[frame].src;	
	 
   // in case of IE<7 switch the source of the AlphaImageLoader (not working)
   /*if(browser.isIE && browser.version < 7)
   {
     g_animator.filters(0).sizingMethod='scale';
     g_animator.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = g_frames[frame].src;
   }*/ 	

   // increment frame
   frame++;
   if(frame >= nr_g_frames)
     frame = 0;
      
   if(frame == 1) // freeze on first frame 
     setTimeout('gAnimate(1)', 10000);
   else
     setTimeout('gAnimate('+frame+')', 200);

}
var activeImgbar = null;
var menuMove = false;
var menuWidth = 1200;

$(document).ready(function(){

  $("div.menubuttons > a").click(function(){this.blur(); activate_menubutton(this); return false;});
  $("div.submenubuttons > a").click(function(){this.blur(); activate_submenubutton(this); return false;});

  // make sure menu scroll position is passed on 
  $("div.menuimgbars a").click(function(){this.blur(); var l=parseInt($(this).parent().position().left); if(l!=0) this.href +='&l='+l;}); 

  $("#menu_move_left").mouseover(function(){slide_menu('left')})
                      .mouseout(function(){$("#page_menu div.active_menubar div.active_imgbar").stop();});
  $("#menu_move_right").mouseover(function(){slide_menu('right')})
                       .mouseout(function(){$("#page_menu div.active_menubar div.active_imgbar").stop();});

  // set initial active image bar
  activeImgbar = $("#page_menu > div.active_menubar div.active_imgbar");

  // show relevant scrollbuttons for current image bar
  show_menu_scrollbuttons();

});


function activate_menubutton(obj)
{
   var buttons = $("div.menubuttons > a");

   // reset all menu buttons
   buttons.removeClass('active');

   // get index number of current button
   var nr = buttons.index(obj);

   // highlight current button
   $(obj).addClass('active');

   // hide all menu bars
   var menubars = $("div.menubar");
   menubars.removeClass('active_menubar');

   // show current menu bar
   menubars.eq(nr).addClass('active_menubar');

   // set active imgbar
   activeImgbar = menubars.eq(nr).find('div.active_imgbar');

   // show relevant scroll buttons
   show_menu_scrollbuttons();

}

function activate_submenubutton(obj)
{
  var buttons = $(obj).parent().find('a');
 
  // reset all buttons
  buttons.removeClass('active');

  // get index number of current button
  var nr = buttons.index(obj);

  // highlight current button
  $(obj).addClass('active');

  // hide all menu image bars
  var imgbars = $(obj).parent().siblings('.menuimgbars').find('div');
  imgbars.removeClass('active_imgbar');

  // set active image bar
  activeImgbar = imgbars.eq(nr);
  activeImgbar.addClass('active_imgbar');

  // show scroll buttons
  show_menu_scrollbuttons();

}

function show_menu_scrollbuttons()
{
  $("#menu_move_right").css('display','none');
  $("#menu_move_left").css('display','none');

  if(activeImgbar.width() > menuWidth)
  {
    if(activeImgbar.position().left < 0) $("#menu_move_right").css('display','block');
    if(activeImgbar.position().left+activeImgbar.width() > menuWidth) $("#menu_move_left").css('display','block');
  }
}

function slide_menu(direction)
{

  var container = $("#page_menu div.active_menubar div.menuimgbars");
  var thumbbar = $("#page_menu div.active_menubar div.active_imgbar");

  var type = 'swing';
  if(direction == 'left')
  {
    var distance = thumbbar.width() + thumbbar.position().left - container.width();
    if(distance > 2000) type = 'linear';
    thumbbar.animate({left: '-='+distance+'px'}, (6*distance), type, function(){$("#menu_move_left").css('display','none')});
    $("#menu_move_right").css('display','block');
  }
  else
  {
    var distance = -thumbbar.position().left;
    if(distance > 2000) type = 'linear';
    thumbbar.animate({left: '+='+distance+'px'}, (6*distance), type, function(){$("#menu_move_right").css('display','none')});
    $("#menu_move_left").css('display','block');
  }

}

$(document).ready(function(){init_slideshow();});


function init_slideshow()
{
  // add functionality to slideshow menu buttons
  $("#slideshow_menu a").click(function(){return switch_slideshow(this);});

  // make thumbs clickable
  $("#slideshow_thumbs_container div img").click(function(){return show_slide(this);});
       
  // add functionality to scroll arrows
  $("#slide_thumbs_left").mouseover(function(){ slide_thumbbar('left');}).mouseout(function(){$("#slideshow_thumbs_container div.active").stop();});
  $("#slide_thumbs_right").mouseover(function(){ slide_thumbbar('right');}).mouseout(function(){$("#slideshow_thumbs_container div.active").stop();});
  $("#scroll_text_up").mouseover(function(){ scroll_text('up');}).mouseout(function(){$("#slideshow_descriptions div.active").stop();});
  $("#scroll_text_down").mouseover(function(){ scroll_text('down');}).mouseout(function(){$("#slideshow_descriptions div.active").stop();});
  $("#scroll_slidetext_up").mouseover(function(){ scroll_slidetext('up');}).mouseout(function(){$("#slideshow_texts div.active").stop();});
  $("#scroll_slidetext_down").mouseover(function(){ scroll_slidetext('down');}).mouseout(function(){$("#slideshow_texts div.active").stop();}); 

  // show relevant scroll arrows (only after page load because otherwise it doesn't work in certain browsers)
  $(window).load(function(){ 

    // slideshow description scroll arrow
    if($('#slideshow_descriptions div.active').height() > $('#slideshow_descriptions').height()) $('#scroll_text_up').css('display','block');
    // slide text scroll arrow
    if($('#slideshow_texts div.active').height() > $('#slideshow_texts').height()) $('#scroll_slidetext_up').css('display','block');
    // thumbbar scroll arrow
    if($("#slideshow_thumbs_container div.active").width() > $("#slideshow_thumbs_container").width()) $("#slide_thumbs_left").css('display','block');

    });
  
  // center all slides on load and show first slide
  //$(window).load(function(){ $("#slideshow img").each(function(){center_slide(this);}); 
  //                           $("#slide0").fadeIn(1000); $("#slide_text0").fadeIn(1000);});
}

function slide_thumbbar(direction)
{
  var container = $("#slideshow_thumbs_container");
  var thumbbar = $("#slideshow_thumbs_container div.active");

  if(direction == 'left')
  {
    var distance = thumbbar.width() + thumbbar.position().left - container.width();
    thumbbar.animate({left: '-='+distance+'px'}, (10*distance), 'swing', function(){$("#slide_thumbs_left").css('display','none')});
    $("#slide_thumbs_right").css('display','block');
  }
  else
  {
    var distance = -thumbbar.position().left;
    thumbbar.animate({left: '+='+distance+'px'}, (10*distance), 'swing', function(){$("#slide_thumbs_right").css('display','none')});
    $("#slide_thumbs_left").css('display','block');
  }

}

function scroll_text(direction)
{
  var container = $("#slideshow_descriptions");
  var text = $("#slideshow_descriptions div.active");

  if(direction == 'up')
  {
    var distance = text.height() + text.position().top - container.height();
    text.animate({top: '-='+distance+'px'}, (10*distance), 'swing', function(){$("#scroll_text_up").css('display','none')});
    $("#scroll_text_down").css('display','block');
  }
  else
  {
    var distance = -text.position().top;
    text.animate({top: '+='+distance+'px'}, (10*distance), 'swing', function(){$("#scroll_text_down").css('display','none')});
    $("#scroll_text_up").css('display','block');
  }

}

function scroll_slidetext(direction)
{
  var container = $("#slideshow_texts");
  var text = $("#slideshow_texts div.active");

  if(direction == 'up')
  {
    var distance = text.height() + text.position().top - container.height();
    text.animate({top: '-='+distance+'px'}, (20*distance), 'swing', function(){$("#scroll_slidetext_up").css('display','none')});
    $("#scroll_slidetext_down").css('display','block');
  }
  else
  {
    var distance = -text.position().top;
    text.animate({top: '+='+distance+'px'}, (20*distance), 'swing', function(){$("#scroll_slidetext_down").css('display','none')});
    $("#scroll_slidetext_up").css('display','block');
  }

}


function switch_slideshow(obj)
{
  var buttons = $("#slideshow_menu a");
  var thumbbars = $("#slideshow_thumbs_container div");
  var descriptions = $("#slideshow_descriptions div").not('#scroll_text_up').not('#scroll_text_down');

  // de-select all slideshow buttons 
  buttons.removeClass('active');
  // get index number of current button
  var nr = buttons.index(obj);
  // activate new button
  buttons.eq(nr).addClass('active').blur();

  // show current slideshow description and thumbbar
  descriptions.removeClass('active').eq(nr).addClass('active');
  thumbbars.removeClass('active').eq(nr).addClass('active');

  // show relevant text scroll arrows
  $('#scroll_text_up').css('display','none');
  $('#scroll_text_down').css('display','none');
  var activeText = $('#slideshow_descriptions div.active');
  var textContainerHeight = $('#slideshow_descriptions').height();
  if(activeText.height() > textContainerHeight)
  {
    if(activeText.position().top < 0) $('#scroll_text_down').css('display','block');
    if(activeText.position().top+activeText.height() > textContainerHeight) $('#scroll_text_up').css('display','block');
  }

  // show relevant thumbbar scroll arrows
  $('#slide_thumbs_right').css('display','none');
  $('#slide_thumbs_left').css('display','none');
  var activeThumbbar = $('#slideshow_thumbs_container div.active');
  var thumbsContainerWidth = $('#slideshow_thumbs_container').width();
  if(activeThumbbar.width() > thumbsContainerWidth)
  {
    if(activeThumbbar.position().left < 0) $('#slide_thumbs_right').css('display','block');
    if(activeThumbbar.position().left+activeThumbbar.width() > thumbsContainerWidth) $('#slide_thumbs_left').css('display','block');
  }

  // show first slide of current slideshow
  show_slide(thumbbars.eq(nr).find('img:first').get(0));

  return false;
}

function center_slide(obj)
{
   var nr = obj.id.replace('slide','');
   var obj = $(obj);
   var container = obj.parent();
   if(obj.width()) // if the slide has no width yet it's not properly loaded and should not be centered
   {
     obj.css('left', (container.width() - obj.width())/2);
     obj.css('top', (container.height() - obj.height())/2); 
   }
}

function show_slide(obj)
{
  // determine slide number
  var nr = obj.id.replace('thumb','');

  // check if we're not dealing with the already selected slide
  //if($("#slideshow img").eq(nr).hasClass('active')) return false;

  // hide previous slide and text
  $("#slideshow img.active").fadeOut(1000).removeClass('active');
  $("#slideshow_texts div.active").fadeOut(1000).removeClass('active');

  /*// center current slide
  var slide = $("#slide"+nr); 
  center_slide(slide.get(0));*/

  // show current slide
  $("#slide"+nr).fadeIn(1000).addClass('active'); 
  $("#slide_text"+nr).fadeIn(1000).addClass('active'); 

  // show relevant slidetext scroll arrows
  $('#scroll_slidetext_up').css('display','none');
  $('#scroll_slidetext_down').css('display','none');
  var activeText = $('#slideshow_texts div.active');
  var textContainerHeight = $('#slideshow_texts').height();
  if(activeText.height() > textContainerHeight)
  {
    if(activeText.position().top < 0) $('#scroll_slidetext_down').css('display','block');
    if(activeText.position().top+activeText.height() > textContainerHeight) $('#scroll_slidetext_up').css('display','block');
  }

  return false;
}