Help with HTML Coding

Hello.

I created a form to use from a posting to send a subscription request to a Yahoo Group.

Here is the HTML code:

>>>>>>>>>
<form method="get" action="http://groups.yahoo.com/subscribe/ewood/"><table cellspacing="0" cellpadding="2" border="0"></tr><td colspan="2" align="center"><em>Subscribe to eWood</em></td></tr><tr><td><br><input type="text" name="user" value="type your email address here" size="26"></td><tr></tr><td><br><input type="image" border="0" alt="Click here to join ewood" name="Click here to join ewood" src="http://us.i1.yimg.com/us.yimg.com/i/yg/img/i/us/ui/join.gif"></td></tr><tr align="center"></tr></table></form>
<<<<<<<<<<

(>>>>>>leading and trailing characters added for clarity<<<<<<<<<<)

This works fine in Opera 9.10 but does not work when tested with Internet Explorer 7. When using Internet Explorer 7, vBulletin returns the message "Invalid Action Specified"

The URL captured by Opera is:

http://groups.yahoo.com/subscribe/ewood/?user=type+your+email+address+here&Click+here+to+join+ewood.x=40&Click+here+to+join+ewood.y=27

But clicking on the same link in Explorer captures this URL:

http://www.domain.com/community/inlinemod.php?threadid=1353&p=

Can anyone help with getting this to work with all browsers or can you see where the flaw is?

Thanks.

Laura