Enter key not firing in Firefox

Hi.

I have a textbox that I am trying to get to fire (run some javascript code) in Firefox. The code works just fine in IE, but it doesn't in ie.

This is where I stand right now.

Here how I defined my text box

<input type="text" runat="server" id="tbSearch" onblur="javascript:SearchEnter();" onkeydown="javascript:SearchEnter();">

The onblur and onkeydown will not fire the javascript. I have an alert box in the js and it never displays.  If I click on an image control (that has java attached) that will fire, but not the Enter key.

My java code looks like this:

function SearchEnter()
{

  if ( (window.event && window.event.keyCode == 13) || (window.event.charCode == 13))
  {
      alert("SearchEnter");
    SubmitSearch();
  }
}


Any help with this would be greatly appreciated.