var IsLocSet = false;
window.onload = function() {
    var MenuItems = document.getElementById("MainNav").getElementsByTagName("a");
    for (var i = 0; i < MenuItems.length; i++) {
        if (document.getElementById('SubNav_' + MenuItems[i].className + '')) {
            MenuItems[i].onmouseover = function() {
                document.getElementById('SubNav_' + this.className + '').style.display = 'block';
            }
            MenuItems[i].onmouseout = function() {
                document.getElementById('SubNav_' + this.className + '').style.display = 'none';
            }
            document.getElementById('SubNav_' + MenuItems[i].className + '').onmouseover = function() {
                IsLocSet = (document.getElementById(this.id.substring(7)).style.backgroundPosition != '')
                document.getElementById(this.id.substring(7)).style.backgroundColor = '#6c3a74';
                document.getElementById(this.id.substring(7)).style.backgroundPosition = '-240px';
                this.style.display = 'block';
            }
            document.getElementById('SubNav_' + MenuItems[i].className + '').onmouseout = function() {
                if (IsLocSet) {
                    document.getElementById(this.id.substring(7)).style.backgroundColor = '';
                } else {
                    document.getElementById(this.id.substring(7)).removeAttribute("style");
                }
                this.style.display = 'none';
            }
        }
    }
}