function rollOver(){
    var preLoad = new Object();
    $('img.btn').not("[@src*='_on.']").each(function(){
        var imgSrc = this.src;
        var fType = imgSrc.substring(imgSrc.lastIndexOf('.'));
        var imgName = imgSrc.substr(0, imgSrc.lastIndexOf('.'));
        var imgOver = imgName + '_on' + fType;
        preLoad[this.src] = new Image();
        preLoad[this.src].src = imgOver;
        $(this).hover(
            function (){
                this.src = imgOver;
            },
            function (){
                this.src = imgSrc;
            }
        );
    });
}
$(function(){
	rollOver();
	try{document.execCommand('BackgroundImageCache', false, true);}catch(e){};
	$(".btns a,.cbtn2 a").click(function(){
		_gaq.push(['_trackEvent','seminar',$(this).attr("name")]);
	});
});