function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}

function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        w_home_over = newImage("images/w_home_over.gif");
        w_process_over = newImage("images/w_process_over.gif");
        w_services_over = newImage("images/w_services_over.gif");
        w_portfolio_over = newImage("images/w_portfolio_over.gif");
        w_quote_over = newImage("images/w_quote_over.gif");
        w_support_over = newImage("images/w_support_over.gif");
        w_contact_over = newImage("images/w_contact_over.gif");
        w_about_over = newImage("images/w_about_over.gif");
        preloadFlag = true;
    }
}