Java Script

Hi
i am getting one peculiar problem.i have two textboxes and one listbox.if the user doesn't enter any thing in the
text box and click on enter key from key board.then its showing error messages correctly.
i have another page in that one textbox and one listbox.if the user doesn't enter any thing in the
text box and click on enter key from key board.then its not showing error messages.

i am using same code for both pages.

plz tell me why its not working.

i am using javascript,ASP.

This is my javascript function
function enterkey()
{      
                 if(event.keyCode==13)
{
      checkfields();
      }
}
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