Need help with JQuery..

Need help with JQuery..

I can't seems to open/run my jquery file for 3 days now and keeps me wondering what sort of my problem is. Just last week i can hover, slidetoggle, and other effects with the page i created. I presumed i'm correct with the code that i had:
 <script type="text/javascript" src="jquery/jquery.js"></script>
 <script type="text/javascript" src="jquery/menu.js"></script>
 and my code for the menu.js....
  1.  $(document).ready(function()
  2.  {
  3.  $('.menu').hover(function()
  4.  {
  5.  $('.submenu').slideToggle();
  6.  });
  7.  });
 Are there any problems with this?