var preLoadImg = new Object();
 
function initRollOvers(){
    $("img.ov").each(function(){
        var imgSrc = this.src;
        var sep = imgSrc.lastIndexOf('.');
        var onSrc = imgSrc.substr(0, sep) + '_o' + imgSrc.substr(sep, 4);
         preLoadImg[imgSrc] = new Image();
         preLoadImg[imgSrc].src = onSrc;
        $(this).hover(
            function() { this.src = onSrc; },
            function() { this.src = imgSrc; }
        );
    });
}
$(function(){
    initRollOvers();
});

$.preloadImages = function() {
	for (var i = 0; i<arguments.length; i++) {
		img = new Image();
		img.src = arguments[i];
	}
}
$.preloadImages (
    // path from document root.
	// separation ',' (comma)
	// example "/pathToFile/filename.gif",
    // Main Navigation
   "/img/mnav-home_o.gif",
   "/img/mnav-about_o.gif",
   "/img/mnav-service_o.gif",
   "/img/mnav-faq_o.gif",
   "/img/mnav-brand_o.gif",
   "/img/mnav-contact_o.gif",
   // SideWidget
   "/img/app-flow_o.gif",
   "/img/app-form_o.gif",
   "/img/brandcube_o.gif",
   "/img/cp-10th_o.gif",
   "/img/cube-commitment_o.gif",
   "/img/cube-initiative_o.gif",
   "/img/news-label_o.gif",
   "/img/ban-cube24_o.gif",
   "/img/ban-kaigi_o.gif",
   "/img/ban-rentaloffice_o.gif"
);