$(document).ready(function () { 
	$('#facebook').hover(function() {
		var currentImg = "/res/img/navs/main/fb_roll.jpg";
		$('#facebook').attr('src', currentImg);
	}, function() {
		var currentImg = "/res/img/navs/main/fb_flat.jpg";
		$('#facebook').attr('src', currentImg);
	});
});