$(function() {
	$('#navbar li a').append('<span class="hover"></span>');
	$('#navbar li a').hover(function() {
		$('.hover', this).stop().animate({
			'opacity': 1
			}, 700, 'easeOutSine');
	},function() {
		$('.hover', this).stop().animate({
			'opacity': 0
			}, 500, 'easeOutExpo');
	});
});

<!--
function externalLinks() {

	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");

	for (var i=0; i<anchors.length; i++) {
	   var anchor = anchors[i];
	   if (anchor.getAttribute("href") &&
	       anchor.getAttribute("rel") == "external")
	     anchor.target = "_blank";
	}
}

window.onload = externalLinks;
// -->