Need help with html in aspx

Hi,

I'm making my own site in asp .net. Bascially I provide domain registration and web hosting services, So the first thing required was to keep domain checking facility and I got a html code from checkdomain.com. Here is the code:

<FORM ACTION="http://www.checkdomain.com/cgi-bin/checkdomain.pl" METHOD="GET">
<CENTER>
Check this domain:
<INPUT TYPE="TEXT" NAME="domain" SIZE="20">
<INPUT TYPE="SUBMIT" VALUE="Enter">
<INPUT TYPE="HIDDEN" NAME="linkname" VALUE="Your Name Here">
<INPUT TYPE="HIDDEN" NAME="linkurl" VALUE="http://YOUR.URL/">
</CENTER>
</FORM>

Now since every aspx page has only one form tag there is no direct way to keep this on the page so I created a web usercontorl and kept an then included it in the page, but still it's not working. The same thing I did with google search box and it's working. I tested this code by pasting it in a html file and running it. The code is absolutely fine. Please help me out.

Thanks in advance.