DW cs4 php form redirects to index, not thank you

Question

Hi, I want my form to go to the thank you page and it goes to the homepage. Thanks for your help in advance!
Libby
      <td bgcolor="#FFFFFF"><form id="form1" name="form1" method="post" action="/gdform.php">
        <span id="sprytextfield1">
        <label for="Name">Name</label>
        <input name="Name" type="text" id="Name" size="60" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span>
        <p><span id="sprytextfield2">
        <label for="Address">Address</label>
        <input name="Address" type="text" id="Address" size="58" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span></p>
        <p><span id="sprytextfield3">
        <label for="City">City</label>
        <input name="City" type="text" id="City" size="35" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span></p>
        <p><span id="sprytextfield4">
        <label for="State">State</label>
        <input name="State" type="text" id="State" size="6" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span></p>
        <p><span id="sprytextfield5">
        <label for="Zip">Zip</label>
        <input name="Zip" type="text" id="Zip" size="10" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span></p>
        <p><span id="sprytextfield6">
        <label for="Name on PayPal Account">Name on PayPal Account</label>
        <input type="text" name="Name on PayPal Account" id="Name on PayPal Account" />
        <span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldMinCharsMsg">Minimum number of characters not met.</span><span class="textfieldMaxCharsMsg">Exceeded maximum number of characters.</span></span></p>
        <p>
          <label for="Message">Message</label>
          <textarea name="Message" id="Message" cols="55" rows="5"></textarea>
        </p>
        <p>
          <label for="Submit"></label>
          <input type="submit" name="button" id="button" value="Submit" />
        </p>
        <input type="hidden" name="receipient" id="receipient" />
        <input name="hiddenField" type="hidden" id="hiddenField" value="thankyou.html" />
      </form>

Answer 1

Gary,
Here is the code that I have for another site. This file was NOT in the site folder that I am working on now. I just copied one there in case needed.
Lib
<?php
    $request_method = $_SERVER["REQUEST_METHOD"];
    if($request_method == "GET"){
      $query_vars = $_GET;
    } elseif ($request_method == "POST"){
      $query_vars = $_POST;
    reset($query_vars);
    $t = date("U");
    $fp = fopen("../data/gdform_$t","w");
    while (list ($key, $val) = each ($query_vars)) {
     fputs($fp,"<GDFORM_VARIABLE NAME=$key START>\n");
     fputs($fp,"$val\n");
     fputs($fp,"<GDFORM_VARIABLE NAME=$key END>\n");
     if ($key == "redirect") { $landing_page = $val;}
    fclose($fp);
    if ($landing_page != ""){
header("Location: http://".$_SERVER["HTTP_HOST"]."/$landing_page");
    } else {
header("Location: http://".$_SERVER["HTTP_HOST"]."/");
?>