var img = new Array();
	if (document.images) {
		img[0] = new Image();       
		img[0].src = "images/nav/home_ro.gif";
		img[1] = new Image();       
		img[1].src = "images/nav/who_ro.gif";
        img[2] = new Image();       
		img[2].src = "images/nav/mgmi_ro.gif";
        img[3] = new Image();       
		img[3].src = "images/nav/clients_ro.gif";
        img[4] = new Image();       
		img[4].src = "images/nav/contact_ro.gif";
        img[5] = new Image();       
		img[5].src = "images/nav/overview1_ro.gif";
		img[6] = new Image();       
		img[6].src = "images/nav/affiliate_ro.gif";
	}
	currentIndex = 0;
	oldsrc = "";
	function on(index) {
		if (document.images) {
			currentIndex = index;
			oldsrc = document.images["btn"+index].src;
			document.images["btn"+index].src = img[index].src;      
		}
	}
	function off() {
		if (document.images)
			document.images["btn"+currentIndex].src = oldsrc;
		}