I am having a problem on firefox.
I have an event (onkeyPress) on a textarea, which should trigger a function when the key pressed is Intro.
I would have the following on HTML:
HTML Code:
<textarea id="idtextarea" onkeyDown="showUser(this.value)"></textarea>
In Javascript:

function showUser(this.value)
var keycode;
if(window.event) keycode = window.event.keyCode;
else if (e) keycode = e.which;
else return true;
if (keycode == 13)


It works on the main browsers but Firefox. Nothing happens on this browser.

I would appreciate any help.
Thank you very much.