<!------------------------ JAVASCRIPT FOR TOP MENU BEGIN ------------------>
    var Menus = new Array();
    
    function on(num){
        document ['menu' + num].src = Menus[1][num].src;
    }
    
    function off(num){
        document ['menu' + num].src = Menus[0][num].src;
    }
    
    function MenuSubSelect(select){
        for ( var i = 1; i < Menus[0].length; i++ ){
            if(document.getElementById('submenu' + i) != null){
                if (i == select){
                    //document.all['submenu' + i].style.visibility = "";
                    document.getElementById('submenu' + i).style.visibility = "";
                    document['menu' + i].src =  Menus[1][i].src;
                } else {
                    //document.all['submenu' + i].style.visibility = "hidden";
                    document.getElementById('submenu' + i).style.visibility = "hidden";
                    document['menu' + i].src =  Menus[0][i].src;
                }
            }
        }			
    }
    
    function preloadMenuImage(){
        for(i = 0; i < arguments.length; i++) {
            num = Math.floor(i / 2) + 1;
            if(Menus[i % 2] == null) Menus[i % 2] = new Array();
            if(Menus[i % 2][num] == null) Menus[i % 2][num] = new Image();
            Menus[i % 2][num].src = arguments[i];
        }
    }  
<!------------------------ JAVASCRIPT FOR TOP MENU END -------------------->
<!------------------------ JAVASCRIPT FOR LEFT MENU BEGIN ----------------->
    var preloadImages = new Array();
    
    function rollOn(prefix, num){
        document [prefix + num].src = preloadImages[prefix][1][num].src;
    }
    
    function rollOff(prefix, num){
        document [prefix + num].src = preloadImages[prefix][0][num].src;
    }
    
    function preloadImage(prefix){
        for(i = 1; i < arguments.length; i++) {
            num = Math.floor((i -1) / 2);
            if(preloadImages[prefix] == null) preloadImages[prefix] = new Array();
            if(preloadImages[prefix][i % 2] == null) preloadImages[prefix][i % 2] = new Array();
            if(preloadImages[prefix][i % 2][num] == null) preloadImages[prefix][i % 2][num] = new Image();      
            preloadImages[prefix][i % 2][num].src = arguments[i];
        }
    }
<!------------------------ JAVASCRIPT FOR LEFT MENU END ------------------->