$(document).keydown not working

Question

Edit::

Thanks Everyone for being helpful, but I tracked my problem as <script src="jquery.js" /> instead of <script src="jquery.js"></script>. Please vote to close

Any idea why

$(function(){
   $(document).keydown(function(evt) {
         alert('Hello');
     }); 
})

is not working? I am using Firefox 3.6.13 on Ubuntu 10.10. Well I copied it form here.

Answer 1

Use delegate():

$(window).delegate('*', 'keypress', function (evt){
        alert("erm");
      });

Answer 2

Use

  jQuery(document).bind('keydown', function (evt){
    alert('Hello');
  });

You may test if quick using firebug console (run it). You now get an alert box everytime you push a button on the document. I used Firefox 3.6.13 to verify this.