Need help with this coding..

[hopeless]

Hi,

i downloaded a forum, and on some pages there is a drop down combo box indicating to a next page..

so i click it and nothing happens...here is some code:
<form name="PageNum1" action="forum.asp">
<td><font face="Verdana, Arial, Helvetica" size="2">
<input name="FORUM_ID" type="hidden" value="34">
<input name="sortfield" type="hidden" value="lastpost">
<input name="sortorder" type="hidden" value="">
<b>Page: </b><select name="whichpage" size="1" onchange="ChangePage(1);">
<option value="1">1</option>
etc...

and <form name="PageNum1" action="topic.asp">
<td bgcolor="lightslategray" nowrap><font face="Verdana, Arial, Helvetica" size="2" color="darkslateblue">
<input type="hidden" name="TOPIC_ID" value="5229">
<b>Page: </b><select name="whichpage" size="1" onchange="ChangePage(1);">
<option selected value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
etc...

it says:
Firefox can't find the file at
/forum.asp?FORUM_ID=34&sortfield=lastpost&sortorder=&whichpage=3
the actual file name:
forum.asp@FORUM_ID=34&sortfield=lastpost&sortorder=&whichpage=3

i notice the problem is the ? as the saved file is a @ how can i fix this?

thanks..i don't have IIS installed aswell...all pages load great..