$(document).ready(function(){
	
	
	
	$("#nav a").not('.bubble').hover(
		// over
		function(){

			// store the original image src
			$(this).children(":first-child").data( "originalsrc" , $(this).children(":first-child").attr("src") );
			
			// add -over to the image unless it is already -over
			if (!$(this).children(":first-child").attr("src").match(/-over/) ) {
				$(this).children(":first-child").attr( "src", $(this).children(":first-child").attr("src").replace(/\./, "-over.") );
			}
			
		},
		
		// out
		function(){
			// replace the original src
			$(this).children(":first-child").attr(
				"src", $(this).children(":first-child").data("originalsrc")
			);
			
			$(this).children(":first-child").data(
				"originalsrc", null
			);
		}
	);


	$("a").each(function(){
		var href = $(this).attr('href');
		if ( href.match(/\.pdf$/) ) {
			$(this).click(function() {
				pageTracker._trackPageview(href);
            });
		}
	});	
	
	
});



window.onload = function() {
		// preload
		$("#nav a img").not('.bubble').each(
			function() {
				if (!$(this).attr("src").match(/-over/) ) {
					$("<img>").attr( "src", $(this).attr("src").replace(/\./, "-over.") );
				}
			}
		);
}