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) {
		left_row2col2_iomhome_over = newImage("images/left-row2col2-iomhome-over.gif");
		left_row3col2_search_over = newImage("images/left-row3col2-search-over.gif");
		left_row4col2_over = newImage("images/left-row4col2-over.gif");
		cdshome_over = newImage("images/cdshome-over.gif");
		help_over = newImage("images/help-over.gif");
		feedback_over = newImage("images/feedback-over.gif");
		preloadFlag = true;
	}
}