function rollOver(link){
	var img = link.firstChild;
	var imgURL = img.src;
	var spl = imgURL.split("/");
	var fullFilename = spl[spl.length-1];
	var filePath = imgURL.substr(0,(imgURL.length-fullFilename.length));
	var splitFilename = fullFilename.split(".");
	var fileName = splitFilename[0];
	var extension = splitFilename[1];
	var newSrc = filePath+fileName+"_over."+extension;
	img.src = newSrc;
}
function rollOut(link){
	var img = link.firstChild;
	var imgURL = img.src;
	var spl = imgURL.split("/");
	var fullFilename = spl[spl.length-1];
	var filePath = imgURL.substr(0,(imgURL.length-fullFilename.length));
	var splitFilename = fullFilename.split(".");
	var fileName = splitFilename[0];
	var extension = splitFilename[1];
	var newSrc = filePath+fileName.substr(0,(fileName.length-5))+"."+extension;
	img.src = newSrc;
}