function doNavRoll(imgName, imgFile)
{
// This little test would prevent button color change for the Home page
// It is not necessary since the change is handled in the HTML by not having 
// onMouseOver or onMouseOut event handlers for the current page button:
//	if(top.location.href.indexOf(imgName + ".aspx") != -1)
//		imgFile = "Images/HMBlue.gif";

	document.images[imgName].src = imgFile;
	return true;
}

function doVolumeRoll(src, over, text)
{
	var root = src.className.slice(0, -2);
	
	if(over)
	{
		src.className = root + "rd";
		document.all.VolumeDesc.innerText = text;
	}
	else
		src.className = root + "bu";
}

function doTrackRoll(src, over, text)
{
	var root = src.className.slice(0, -2);
	
	if(over)
		src.className = root + "rd";
	else
		src.className = root + "g1";
}