I am including an html test form that will replicate parts of the advanced search page you describe. It should give you lots of ideas to work from. Let me know if that is what you are looking for.
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<FORM ACTION="
METHOD="POST" NAME="searchFrm" >
<!-- Your prompts to the user here -->
Testing really complex page<BR>
<INPUT TYPE="HIDDEN" NAME="func" VALUE="search" >
<TABLE>
<TR BGCOLOR="#CCCCCC">
<TD COLSPAN="2">
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">
<B>Full Text</B>
</FONT>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">Look For:</FONT>
<SELECT NAME="mode1">
<OPTION VALUE="Nl" >Answer to a Question </OPTION>
<OPTION VALUE="And" SELECTED>All Words </OPTION>
<OPTION VALUE="Or" >Any Words </OPTION>
<OPTION VALUE="Exact" >Exact Phrase </OPTION>
<OPTION VALUE="LivelinkQuery" >Complex Query </OPTION>
</SELECT>
<FONT SIZE="2" FACE="Arial,Helvetica,sans-serif">Modifier:</FONT>
<SELECT NAME="modifier1">
<OPTION VALUE=""><None></OPTION>
<OPTION VALUE="defaultthesaurus" >Synonyms Of</OPTION>
<OPTION VALUE="stem" >Related To</OPTION>
<OPTION VALUE="phonetic" >Sounds Like</OPTION>
<OPTION VALUE="righttruncation" >Word Begins With</OPTION>
<OPTION VALUE="lefttruncation" >Word Ends With</OPTION>
</SELECT>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<INPUT TYPE="text" NAME="where1" VALUE="help" SIZE="50">
within
<SELECT NAME="within1">
<OPTION VALUE="All" SELECTED>All</OPTION>
<OPTION VALUE="content" >Content</OPTION>
<OPTION VALUE="metadata" >MetaData</OPTION>
</SELECT>
</TD>
</TR>
<TR>
<TD>
<SELECT NAME="option2">
<OPTION VALUE="Or" SELECTED>Or</OPTION>
<OPTION VALUE="And" >And</OPTION>
<OPTION VALUE="And-Not" >Not</OPTION>
</SELECT>
</TD>
<TD>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">Look For:</FONT>
<SELECT NAME="mode2">
<OPTION VALUE="Nl" >Answer to a Question </OPTION>
<OPTION VALUE="And" SELECTED>All Words </OPTION>
<OPTION VALUE="Or" >Any Words </OPTION>
<OPTION VALUE="Exact" >Exact Phrase </OPTION>
<OPTION VALUE="LivelinkQuery" >Complex Query </OPTION>
</SELECT>
<FONT SIZE="2" FACE="Arial,Helvetica,sans-serif">Modifier:</FONT>
<SELECT NAME="modifier2">
<OPTION VALUE=""><None></OPTION>
<OPTION VALUE="defaultthesaurus" >Synonyms Of</OPTION>
<OPTION VALUE="stem" >Related To</OPTION>
<OPTION VALUE="phonetic" >Sounds Like</OPTION>
<OPTION VALUE="righttruncation" >Word Begins With</OPTION>
<OPTION VALUE="lefttruncation" >Word Ends With</OPTION>
</SELECT>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<INPUT TYPE="text" NAME="where2" VALUE="triumph" SIZE="50">
within
<SELECT NAME="within2">
<OPTION VALUE="All" SELECTED>All</OPTION>
<OPTION VALUE="content" >Content</OPTION>
<OPTION VALUE="metadata" >MetaData</OPTION>
</SELECT>
</TD>
</TR>
<TR BGCOLOR="#CCCCCC">
<TD COLSPAN="2">
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">
<B>Scope</B>
</FONT>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<SELECT CLASS="searchBut" MULTIPLE NAME="broker" SIZE="4">
<OPTION VALUE="123550">Admin Help
<OPTION VALUE="128605">Builder Documentation
<OPTION SELECTED VALUE="2245">Enterprise
<OPTION VALUE="2249">Enterprise [All Versions]
<OPTION VALUE="133788">Help
</SELECT>
</TD>
</TR>
<TR BGCOLOR="#CCCCCC">
<TD COLSPAN="2">
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">
<B>Output Options</B>
</FONT>
</TD>
</TR>
<TR>
<TD>
</TD>
<TD>
<INPUT TYPE="HIDDEN" NAME="outputformat" VALUE="FOO">
<INPUT TYPE="RADIO" NAME="rawresultsradio" VALUE="0" CHECKED ONCLICK="this.form.outputformat.value='Foo'" > Normal
<BR>
<INPUT TYPE="RADIO" NAME="rawresultsradio" VALUE="1" ONCLICK="this.form.outputformat.value='htmlbody'"> Raw Results
<BR>
<INPUT TYPE="RADIO" NAME="rawresultsradio" VALUE="2" ONCLICK="this.form.outputformat.value='xml'"> XML Results
</TD>
</TR>
<TR BGCOLOR="#CCCCCC">
<TD COLSPAN="2">
<FONT FACE="Arial,Helvetica,sans-serif" SIZE="2">
<B>Action</B>
</FONT>
</TD>
</TR>
</TABLE>
<INPUT TYPE="SUBMIT" Value="Search">
<BR>
</FORM>