onsubmit="Javascript:..." not working in Netscape

[wxdqz]

This validate function is working fine in ie, but the form posts just like the validate function isn't there when run in Netscape. Is there another way to validate forms in Netscape? Other Javascripts on the same page are working fine in Netscape.

<form method="POST" action="http://www.domain.com/htbin/mailit"
name="textmsg" onsubmit="Javascript: return Validate()">

Thanks