$(document).ready(function(){
	jQuery.preloadimages = function() {
		for(var i = 0; i<arguments.length; i++) {
			jQuery("<img>").attr("src", arguments[i]);
		}
	}
	
	$.preloadimages("images/nav-bio-over.png", "images/nav-books-over.png", "images/nav-events-over.png", "images/nav-contact-over.png", "images/nav-news-over.png", "images/nav-articles-over.png", "images/nav-faq-over.png",
"images/nav-vault-over.png","images/nav-ark-over.png","images/nav-rogue-wave-over.png","images/nav-catalyst-over.png");


    $(".hoverswap").hover(
        function () {
            $(this).attr("src", $(this).attr("src").replace(/.png/, "-over.png"));
        },
        function () {
            $(this).attr("src", $(this).attr("src").replace(/-over.png/, ".png"));
        }
    );


});