function preloadImages(images){
	images_array = images.split(", ");
	for (var i=0; i<images_array.length; i++){
		document["prelaodedImg"+i] = new Image();
		document["prelaodedImg"+i].src = images_array[i];
	}
}
function swapImage(name, image){
	document[name].origSrc = document[name].src;
	document[name].src = image;
}

function swapImageRestore(name){
	document[name].src = document[name].origSrc;
}