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) {
		image_name = newImage("images/image_name.gif");
		preloadFlag = true;
	}
}
function OpenPopUp(loc,wwidth,wheight)
{
window.open(loc,'','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=' + wwidth + ',height=' + wheight + ',screenx=100,screeny=100')
}