Using Enter key for login page makes it beep?

[Codeless]

I have this script on my login page where there are two textboxes that collect username and password:

 

<SCRIPT LANGUAGE="javascript">
if (document.all)
{ 
     document.onkeydown = function ()
     {			
         var key_enter= 13; 
         if (key_enter==event.keyCode)
         {
              document.getElementById('LinkButton1').click()
         }
     }
}
</SCRIPT>

 

I also have an event that handles the linkbutton1.click event in the code behind. I've got two questions...Why is it beeping when I press enter? And the second is the password dissapears when I tab over to linkbutton1. Anyone know why?

[rot13]

I don't know C#, and I don't know ASP.Net, but in VB.Net for Windows Forms, this is what you have to do to remove the beep:

Public Sub TextBox_Keypress(ByVal sender As Object, ByVal e As System.KeyPressEventArgs) 'or w/e it should be

If convert.tochar(keys.enter) = e.keychar then
   'do whatever here
   e.Handled = True 'removes the beep
End If

End Sub

[Codeless]

Thanks for taking the time to respond. However, ASP doesn't have 'handled' as a system event argument. Thanks though!