odd behavoir of alert in FF

Giganews Newsgroups
Subject: odd behavoir of alert in FF
Posted by:  Michael (michael51…@yahoo.com)
Date: Wed, 8 Nov 2006

can anyone explain why I get an endless loop of alerts (alert - hit enter -
alert - hit enter etc) from the following script/page?
It works ok in IE, and works ok in FF if I use the mouse to click the "ok",
but not if I use the enter key....


<script type="text/javascript">
function updateForm(dom)
var qty = document.getElementById(dom).value;

if (qty != "")
  if (qty == 0 || qty > 5)
  alert ("The number may not be 0 and not bigger than 5!");

<form action="#">
Enter a number:
<!-- I changed value="0" to value="" -->
<td> <input type = "text" name = "qty1" id = "qty1" value="" size="15"
onkeyup = "updateForm('qty1');" /> </td>