function preloader() {
		 		if (document.images) {
					var pictData = preloader.arguments;
					loadArray = new Array();
		
					for (var i=0; i < pictData.length; i++) {

            			loadArray[i] = new Image;
            			loadArray[i].src = pictData[i];
            		}

       			}
   		
			}

			function tauschen(id, newsrc) {
			
    			var pict = getPict(id);
   		 			if (pict) {
        				pict.src = newsrc;
    				}
			}

			function getPict(name) {
				var pict = false;
				if (document.images) {
     	 			pict = document.images[name];
    			}
    			if (pict) {
        			return pict;
   		 		}
    			return (false);
			}