submenu gets hidden thought the cursor is over the menu

[phpWebDeveloper]

Hi
I'm creating a very simple menu which i created many times before but this time i'm facing a problem which is the submenu gets hidden though the cursor is over it here's the js code

$(".menu").mouseenter(function(){
    $(this).children("div").slideDown(400);
   console.log("inside submenu");
   });

   $(".menu").mouseleave(function(){
    $(this).children("div").slideUp(400);
    console.log("out of submenu");
  });

you can find the menu here http://mawk3y.net/sky/ the page is in Arabic but the menu link is in englich