function showRollover(imageName) {
	if(document.images)
	document.images[imageName].src = eval(imageName + 'Img_RO.src');
}

function hideRollover(imageName) {
	if(document.images)
		document.images[imageName].src = eval(imageName + 'Img.src');
}

function showMenuRollover(imageName) {
	if(timerID) clearTimeout(timerID);
	showRollover(imageName);
	if(imageName != currentPageMenuItem)
		hideRollover(currentPageMenuItem);
}

function hideMenuRollover(imageName) {
	if(imageName != currentPageMenuItem) {
		hideRollover(imageName);
		// Delay the display of the rollover for the current page by 250 milliseconds
		// to help keep the flicker away when moving between menu items.
		timerID = setTimeout('showRollover("' + currentPageMenuItem + '")', 250);
	}
}