function changeMenuLink() {
	var url = document.URL;
	var fileName = getFileName(url);
	fileName = fileName.substring(0,2);
	document.getElementById(fileName).src = "images/buttonsBayanat/-" + fileName + ".gif";
}


function getFileName(url) {
	var fn = url.match(/\/([a-z0-9_-]+\.\w+)$/i);
	return (fn == null)? "" : fn[fn.length-1];
}