function preloadImages() {
	imgsToPreload = preloadImages.arguments;
	for (i=0; i<imgsToPreload.length; i++) {
	(new Image (80, 20)).src = imgsToPreload[i];
	}	
}

function swapImage(imgName, newImage) {
	document[imgName].src=newImage;
}
	
function openFull (url, winName, popWidth, popHeight) {
	var horizPos = (screen.availWidth - popWidth)/ 2;
	var vertPos = (screen.availHeight - popHeight)/ 2;
	window.open(url, winName, "width=" + popWidth + ", height=" + popHeight + ", resizable=no, top=" + vertPos + ", left=" + horizPos + ", scrollbars=no status=no");
}