function flipNav(strSource, strDirection)
{
	var strImageSrc = document.images[strSource].src;
	if(strImageSrc.indexOf("S.jpg",0)<0)
		if(strDirection=="over") {
			document.images[strSource].src = "images/nav/"+strSource+"o.jpg";
		} else {
			document.images[strSource].src = "images/nav/"+strSource+".jpg";
		}			
}