Simple fade in on body and fade out via nav or link class. I usually use a the css for the fades and stuff, but this should do it....

Fade Out - Fade In

$(document).ready(function() {

	$("body").css("display", "none");

	$("body").fadeIn(500);

	$("nav a, a.suave").click(function(event){
		event.preventDefault();
		linkLocation = this.href;
		$("body").fadeOut(500, redirectPage);
	});

	function redirectPage() {
		window.location = linkLocation;
	}
	
});