Cant get this search form to work the way I want it

What i wanted was a "search by category" option next to my search form. My question was, how would I get it to actually search by category? This has eaten about 4 hours and I know some of you could most likely fix this in less than 20 mins. Please help!

heres my search form (with the categories)

<br><form action='search.php' method='GET'>
        <font face ='sans serif' size='5'>
    <center>
            <s开发者_开发技巧elect name='category'>
<option>&nbsp;</option>
<option value='20'>20</option>
<option value='30'>30</option>
<option value='40'>40</option>
</select><form action="search.php" method="GET">
   <input type='text' size='70' name='search'> 
   <input type='image' value='search' src='images/tickmark.pg'></a><br>

</form>         

You've got two <form> tags, which is invalid. They cannot be nested within each other. As well, using <font> and <center> just shows you're stuck in Netscape 3.0 days. You've also go a dangling </a> with no matching <a> before it.

Try this:

<form action="search" method="get">

<div style="text-align: center">

<select name="category"
  <option ...>
  <option ...>
</select>
&nbsp;

<input type="text" size="70" name="search">

<input type="image" value="search" src="images/tickmark.jpg">

</div>

</form>