[CharlieWon]

Here is the code I am working with:

The javascript for the first box that decides what will be shown in the second box:

function setOptions(chosen) {
var selbox = document.rmavalidation.opttwo;

selbox.options.length = 0;
if (chosen == " ") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--',' ');

}
if (chosen == "Made for Sansa(TM)") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--');
selbox.options[selbox.options.length] = new Option('Made for Sansa(TM) Travel Kit');
selbox.options[selbox.options.length] = new Option('SAN-360 FM Transmitter & Charger');
selbox.options[selbox.options.length] = new Option('iM-490S iMetal Isolation Earphones');
selbox.options[selbox.options.length] = new Option('S42 Data & Charging Cable');

}
if (chosen == "Earphones & Headsets") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--');
selbox.options[selbox.options.length] = new Option('iM-490S iMetal Isolation Earphones');
selbox.options[selbox.options.length] = new Option('iM-390 iMetal Isolation Earphones');
selbox.options[selbox.options.length] = new Option('iM-290 iMetal Stereo Earphones');
selbox.options[selbox.options.length] = new Option('iP-HS2 iMetal Isolation Headset');
selbox.options[selbox.options.length] = new Option('iP-HS1 iMetal Stereo Headset');
}
if (chosen == "FM Transmitters") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--');
selbox.options[selbox.options.length] = new Option('SAN-360 FM Transmitter & Charger');
selbox.options[selbox.options.length] = new Option('ATB-350 FM Transmitter');
}
if (chosen == "MountMaster TV Mounts") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--');
selbox.options[selbox.options.length] = new Option('MountMaster Pro-60 Premium Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Pro-52 Premium Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Tilt-60 Tilting Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Tilt-52 Tilting Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Tilt-45 Tilting Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Flat-60 Low-Profile Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Flat-52 Low-Profile Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Flat-45 Low-Profile Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster Flat-32 Low-Profile Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster SW-24 Swivel Wall Mount');
selbox.options[selbox.options.length] = new Option('MountMaster CP-3025 Ceiling Mount');
}
if (chosen == "Digital Cables") {
selbox.options[selbox.options.length] = new Option('--Please choose a model--');
selbox.options[selbox.options.length] = new Option('USB 2.0');
selbox.options[selbox.options.length] = new Option('FireWire/1394');
selbox.options[selbox.options.length] = new Option('FireWire800/1394b');
selbox.options[selbox.options.length] = new Option('Made for Sansa');
selbox.options[selbox.options.length] = new Option('ioAccessories: USB 2.0/FireWire/Network');
}

The HTML for that code:

 <tr>
               <td><font color="red">*</font>Product Category:<br />              </td>
               <td ><select name="optone" size="1"
onchange="setOptions(document.rmavalidation.optone.options[document.rmavalidation.optone.selectedIndex].value);" required>
<option>--Please choose a category--</option>
<option value="Made for Sansa(TM)">Made for Sansa<font size="-1">TM</font></option>
<option value="Earphones &amp; Headsets">Earphones & Headsets</option>
<option value="FM Transmitters">FM Transmitters</option>
<option value="Digital Cables">Digital Cables</option>
<option value="MountMaster TV Mounts">MountMaster TV Mounts</option>

               </select><br /><br /></td></tr>
<tr><td><font color="red">*</font>Product Model:<br /></td><td>
<select name="opttwo" size="1" required>
<option value>--Please Choose a Model--</option>
</select> <br /><br />
           </td> 
          </tr>

Then on the Validation page HTML:

<tr>
                      <td class='inputverify'>Product Category:</td>
                                             <td>  <br />
                          <select name="optone" size="1">
                            <option value='<?PHP echo($optone)?>'><?PHP echo($optone) ?></option>
                            <option value="Made for Sansa">Made for Sansa</option>
                            <option value="Earphones $ Headsets">Earphones &amp; Headsets</option>
                            <option value="FM Transmitters">FM Transmitters</option>
                            <option value="Digital Cables">Digital Cables</option>
                            <option value="MountMaster TV Mounts">MountMaster TV Mounts</option>
                          </select>
                          <?PHP if (!$optone)
      echo "<font face=arial size=2 color=red>&nbsp; Product Category is Required. Please go <a class=type1 href=rmareq.html onClick=history.go(-1)>Back</a> and fill it in.</font>";?>
                          
                          <br />
                          <br /></td>
                    </tr>
                    <tr>
                      <td class='inputverify'>Product Model:</td>
                                             <td>  <br />
                          <select name="opttwo" size="1">
                            <option value='<?PHP echo($opttwo)?>'><?PHP echo($opttwo)?></option>
                          </select>
                          <?PHP if (!$opttwo)
      echo "<font face=arial size=2 color=red>&nbsp; Product is Required. Please go <a class=type1 href=rmareq.html onClick=history.go(-1)>Back</a> and fill it in.</font>";?>
                          <br />
                          <br />                      </td>
                    </tr>

The Javascript is the same as the first page.

Thank you for taking a look!