$(document).ready(function(){

		$("#nav-container li").each(function(){
			var link = $(this).children("a");
			var image = $(link).children("img");
			var imgsrc = $(image).attr("src");

			// add mouseover
			$(link).mouseover(function(){
				var on = imgsrc.replace(/.jpg$/gi,"_active.jpg");
				$(image).attr("src",on);
			});

			// add mouse out
			$(link).mouseout(function(){
				$(image).attr("src",imgsrc);
			});
		});

	});