textbox focus

[mar_zim]

hi to everyone im very new in this thing.
why this code wont work?
whats wrong w/ it?
what i want to achieve is when i hit the enter key it will get focus to another textbox..

<form>
    <input type="textbox" name="textbox1" onkeypress="keydown(event)" >
    <input type="textbox" name="textbox2">
</form>
<script>
    function keydown(e){
     if (!e) var e = window.event;
    if (e.keyCode) code = e.keyCode;
    else if (e.which) code = e.which;
    if (code==13){
    textbox2.focus();
    }
    }
</script> 

thanks in advance guys..
more power