function newImage(arg) {
 	if (document.images) {
 		rslt = new Image();
 		rslt.src = arg;
 		return rslt;
 	}
 }

 function changeImages() {
 	if (document.images && (preloadFlag == true)) {
 		for (var i=0; i<changeImages.arguments.length; i+=2) {
 			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
 		}
 	}
 }

var preloadFlag = false;

function preloadImages() {
 	if (document.images) {
 		button1 = newImage("ld_images/postericon_o.jpg");
 		preloadFlag = true;
 	}
 }