menuHover = function () {
    document.getElementById('about_sub').onmouseover = function () {
        document.getElementById('about').className = "mainNav_linkON";
    }
    document.getElementById('about_sub').onmouseout = function () {
        document.getElementById('about').className = "mainNav_link";
    }

    document.getElementById('services_sub').onmouseover = function () {
        document.getElementById('services').className = "mainNav_linkON";
    }
    document.getElementById('services_sub').onmouseout = function () {
        document.getElementById('services').className = "mainNav_link";
    }

    document.getElementById('products_sub').onmouseover = function () {
        document.getElementById('products').className = "mainNav_linkON";
    }
    document.getElementById('products_sub').onmouseout = function () {
        document.getElementById('products').className = "mainNav_link";
    }

    document.getElementById('corner_sub').onmouseover = function () {
        document.getElementById('corner').className = "mainNav_linkON";
    }
    document.getElementById('corner_sub').onmouseout = function () {
        document.getElementById('corner').className = "mainNav_link";
    }
}

function addEvent(obj, type, fn) {
    if (obj.attachEvent) {
        obj['e' + type + fn] = fn;
        obj[type + fn] = function () { obj['e' + type + fn](window.event); }
        obj.attachEvent('on' + type, obj[type + fn]);
    } else
        obj.addEventListener(type, fn, false);
}
function removeEvent(obj, type, fn) {
    if (obj.detachEvent) {
        obj.detachEvent('on' + type, obj[type + fn]);
        obj[type + fn] = null;
    } else
        obj.removeEventListener(type, fn, false);
}

addEvent(window, 'load', function () { menuHover(); });