var id = "asdasd";
			var classname = "thumbnail";
			var img;
			var thumbs;
			var thumb = 'thumb.jpg';
			var blank = 'blank.jpg';
			var thumbcount = 0;
			
			var timeout = 3000;
			
			var originalImages;
			
			function swap(id,img){
				document.getElementById(id).src= img;
			}
			
			//onload="initThumbs();"
			

			function getElementsByClassName(class_name)
			{
			  var all_obj,ret_obj=new Array(),j=0;
			  if(document.all)all_obj=document.all;
			  else if(document.getElementsByTagName && !document.all)all_obj=document.getElementsByTagName("*");
			  for(i=0;i<all_obj.length;i++)
			  {
			    if(all_obj[i].className==class_name)
			    {
			      ret_obj[j]=all_obj[i];
			      j++
			    }
			  }
			  return ret_obj;
			}
			
			function saveOriginalImages(thumbarray){
				var ret_orig = new Array();
				for(i=0;i<thumbarray.length;i++){
					ret_orig[i] = thumbarray[i].src;
				}
				return ret_orig;
			}
			
			function initThumbs(){
				thumbs = getElementsByClassName(classname);
				thumbcount = thumbs.length;
				originalImages = saveOriginalImages(thumbs);
				resetThumbs(thumbs);
				swapdat();
				//alert(originalImages.length);
			}
			
			function resetThumbs(thumbarray){
				// alle thumbnails durch blank ersetzen
				for(i=0;i<thumbarray.length;i++){
					//document.getElementById(id).src= blank;
					thumbarray[i].src = blank;
				}
				
				// wechselfunktion starten
				// zufallselement
				//elementindex = Math.random()*10%thumbarray.length;
				elementindex = Math.ceil( Math.random() * (thumbarray.length) )-1;
			}
			
			function swapdat(){
				resetThumbs(thumbs);
				elementindex = Math.ceil( Math.random() * (thumbs.length) )-1;
				thumbs[elementindex].src = originalImages[elementindex];
				
				setTimeout("swapdat()",timeout);
			}