if (document.images) {
//Preload main nav bar

	var homeoff = new Image();
	homeoff.src = "../img/topmenu/home.gif";
        var homeon = new Image();
        homeon.src = "../img/topmenu/home_2.gif";

	var categoryoff = new Image();
	categoryoff.src = "../img/topmenu/category.gif";
        var categoryon = new Image();
        categoryon.src = "../img/topmenu/category_2.gif";

	var advancedoff = new Image();
	advancedoff.src = "../img/topmenu/advanced.gif";
        var advancedon = new Image();
        advancedon.src = "../img/topmenu/advanced_2.gif";

	var portfoliooff = new Image();
	portfoliooff.src = "../img/topmenu/portfolio.gif";
        var portfolioon = new Image();
        portfolioon.src = "../img/topmenu/portfolio_2.gif";
                    
       

}


function rollon(img) {
		if (document.images){
               document[img].src=eval(img+"on.src");			
        }
}

function rolloff(img) {
        if (document.images){
                document[img].src=eval(img+"off.src");
        }}