Any JScript Experts I need help please..

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   I have been trying to take a javascript code that I found on the web to allow my viewers to search my pages on my site.  Everything is working well but I want this search to do more.  I want an advanced search like you see on a lot of webs.  I have an example of what I am trying to do http://ttsmerchandise.com/searchexample.htm.  My problem is that on that page, the only thing that works is the keywords and that's because it contains the form tag that came with the code.  If you want to click view source to get the entire script please do, but here I am just going to list my problem.
This is the form that I have set up in the body of my html page

<form method=get action="javascript:void(0)" onsubmit="search(this); return false;">
<table width="654"><tr><td width="309"><b>Watch
Brands:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</b><select size="1" name="brand">
<option value="0">All Brands</option>

<option selected value="1">Activa</option>

<option value="2">Bulova</option>

<option value="3">Calvin Klein</option>

<option value="4">Casio</option>

<option value="5">Citizen</option>

<option value="6">Colibri</option>

<option value="7">Croton</option>

<option value="8">Esq</option>

<option value="9">Festina</option>

<option value="10">Fossil</option>

<option value="11">Gucci</option>

<option value="12">Invicta</option>

<option value="13">Kenneth Cole</option>

<option value="14">Lassale</option>

<option value="15">Luminox</option>

<option value="16">Movado</option>

<option value="17">Nike</option>

<option value="18">Omega</option>

<option value="19">Pulsar</option>

<option value="20">Rado</option>

<option value="21">Skaggen</option>

<option value="22">Seiko</option>

<option value="23">Seiko Clocks</option>

<option value="24">Swatch</option>

<option value="25">Swiss Army</option>

<option value="26">Tag</option>

<option value="27">Timex</option>

<option value="28">Vanceur</option>

<option value="29">Visage</option>

<option value="30">Wittnauer</option>

<option value="31">Wenger</option>

</select></td><td width="331"><b>Item Number&nbsp; </b><input type=text name=itemn value=""></td></tr>

<tr><td width="309"><b>Additional Keywords:&nbsp; </b><input type=text name=srchval value=""></td><td width="331"><b>Starting
Price:&nbsp;</b> </td<td>&nbsp; <select NAME="loprice">

<option VALUE="25">$From

<option VALUE="50">$50

<option VALUE="100">$100

<option VALUE="150">$150

<option VALUE="200">$200

<option VALUE="300">$300

<option VALUE="400">$400

<option VALUE="500">$500

<option VALUE="600">$600

<option VALUE="800">$800

<option VALUE="1000">$1,000

<option VALUE=