$(
	function() {
		$(".hdr_menu img").hover(
		function() {
			this.src = this.src.replace("-off","-over");
			},
		function() {
			this.src = this.src.replace("-over", "-off");
			}
		);		
	}
);

function swapImage(strName, strNew) {
	document.images[strName].src = strNew;
	}