function menuOver(menuImg, image){
    menuImg.src = "images/menu/" + image + "_hover.gif";
    showSubmenu(image);
}

function menuOut(menuImg, image){
    menuImg.src = "images/menu/" + image + ".gif";
    hideSubmenu(image);
}

function gotoUrl(url) {
    location.href = context + url;
}

function preloadPics() {
    document.preload = new Array();
    if(document.images){
        for(var i=0; i < arguments.length; i++) {
            document.preload[i] = new Image();
            document.preload[i].src = arguments[i];
        }
    }
}

preloadPics(
    'images/menu/about_us_home.gif',
    'images/menu/about_us_home_hover.gif',
    'images/menu/contact_us.gif',
    'images/menu/contact_us_hover.gif',
    'images/menu/portfolio_home.gif',
    'images/menu/portfolio_home_hover.gif',
    'images/menu/services_home.gif',
    'images/menu/services_home_hover.gif'
);