javascript defer attribute causes error in IE

in lib/javascript.php:

<script language="JavaScript" type="text/javascript" defer="defer">

The "defer" causes Internet Explorer to defer processing of the openpopup() {} function definition to after the page has finished loading. This causes an error on pages where openpopup() is called before the page has finished loading, eg. when loading the messages popup window after logging in.

This can be fixed by changing the line to:

<script language="JavaScript" type="text/javascript">

The problem does not effect Firefox.