function findPosX(obj)
	  {
	    var curleft = 0;
	    if(obj.offsetParent)
	        while(1) 
	        {
	          curleft += obj.offsetLeft;
	          if(!obj.offsetParent)
	            break;
	          obj = obj.offsetParent;
	        }
	    else if(obj.x)
	        curleft += obj.x;
	    return curleft;
	  }
	
	function show( collection ) {
		
		for ( i = 1; i <= 5; i ++ ){
			nom = "collection"+i;
			if( nom == collection ){
				if(document.getElementById( collection ).style.display != "block"){
					document.getElementById( collection ).style.display = "block";
				}else{
					document.getElementById( collection ).style.display = "none";
				}
			}else {
				document.getElementById( nom ).style.display = "none";
			}
		}
		
	}
	
	function pop( link , ypos , xpos, unique) {
		
		xpos = xpos+ findPosX( document.getElementById( 'middle' ) ) - 20;
		document.getElementById( 'absolute' ).style.top = ypos+'px';
		document.getElementById( 'absolute' ).style.left = xpos+'px';
		if(unique){
			document.getElementById( 'image1' ).setAttribute( "src" , "images/" + link);
		}else{
			if(document.getElementById( 'image1' ))document.getElementById( 'image1' ).setAttribute( "src" , "images/" + link + "_1.jpg" );
			if(document.getElementById( 'image2' ))document.getElementById( 'image2' ).setAttribute( "src" , "images/" + link + "_2.jpg" );
			if(document.getElementById( 'image3' ))document.getElementById( 'image3' ).setAttribute( "src" , "images/" + link + "_3.jpg" );
		}
		document.getElementById( 'absolute' ).style.visibility = "visible";
		
	}
	
	function fermer() {
		
		document.getElementById( 'absolute' ).style.visibility = "hidden";
		document.getElementById( 'absolute' ).style.top = '0px';
		document.getElementById( 'absolute' ).style.left = '0px';
		if(document.getElementById( 'image1' ))document.getElementById( 'image1' ).setAttribute( "src" , "images/big_white.gif" );
		if(document.getElementById( 'image2' ))document.getElementById( 'image2' ).setAttribute( "src" , "images/small_white.gif" );
		if(document.getElementById( 'image3' ))document.getElementById( 'image3' ).setAttribute( "src" , "images/small_white.gif" );
		
	}