$(document).ready(function()    
{
    $(".lightbox").lightbox({
        fitToScreen: true,
        imageClickClose: false
    });
    $("#menu1").mouseover(function() 
    {
        $("#sub_menu1").css("display","block");
    });
    $("#menu1").mouseout(function() 
    {
        $("#sub_menu1").css("display","none");
    });
    $("#sub_menu1").mouseout(function() 
    {
        $("#sub_menu1").css("display","none");
    });
    $("#sub_menu1").mouseover(function() 
    {
        $("#sub_menu1").css("display","block");
    });
});