I've ever known search engine on php, jsp or asp.
yes its possible with AJAX.
It sounds interesting. I have been trying to find a free search engine tool that won't have lots of ads, etc. that works on a windows server. That is a pretty big list of criteria, I know, but this may have an answer for me.
<FORM method=GET action="http://www.google.com/search">
<input type=hidden name=ie value=UTF-8>
<input type=hidden name=oe value=UTF-8>
<INPUT TYPE=text name=q size=31 maxlength=255 value="">
<INPUT type=submit name=btnG VALUE="Search">
<input type=hidden name=domains value="http://(site here)"><br><input type=hidden name=sitesearch value=""><input type=hidden name=sitesearch value="http://(site here)" checked><br>