valore combo box recuperato in un altra pagina con ajax

[sunsgs]

salve gente, sto utilizzando un multiuploader (fancy upload) ovviamente funziona, ho bisogno però di mandare il file uploadato in una determinata categoria (lo faccio via db)

ho questo

<form action="script.php" method="post" enctype="multipart/form-data" id="form-demo">       <fieldset id="demo-fallback">         <label for="demo-photoupload">             Upload Photos:             <input type="file" name="photoupload" id="demo-photoupload" />                     </label>                  </fieldset>    <?php     include("config.php");      $query = "SELECT * FROM categorie";      $result = mysql_query($query) ;     echo '<select id="cat"> ';     while($row = mysql_fetch_array($result)){     printf("<option value=\"%d\">%s</option>", $row["iD"], $row["nome"]); } echo '</select>'; ?>     <div id="demo-status" class="hide">          

             [url="#"]Browse Files[/url] |             [url="#"]Clear List[/url] |             [url="#"]Upload[/url]         </p>         <div>             <strong class="overall-title">Overall progress[/b]
             [img]./assets/progress-bar/bar.gif[/img]         </div>         <div>             <strong class="current-title">File Progress[/b]
             [img]./assets/progress-bar/bar.gif[/img]         </div>         <div class="current-text"></div>     </div>      <ul id="demo-list">[/list]</form>

poi da ho nel file js

$('demo-upload').addEvent('click', function() { 		swiffy.upload(); 		return false; 	});

la funzione swiffy.upload(); presa da qui

Swiff.Uploader = new Class({      Extends: Swiff,      Implements: Events,      options: {         path: 'Swiff.Uploader.swf',         multiple: true,         queued: true,         typeFilter: null,         url: null,         method: 'post',         data: null,         fieldName: 'Filedata',         target: null,         height: '100%',         width: '100%', callBacks: null     },..............................upload: function(options){         var current = this.options;         options = $extend({data: current.data, url: current.url, method: current.method, fieldName: current.fieldName, options);         if ($type(options.data) == 'element') options.data = $(options.data).toQueryString();         return this.remote('upload', options);     }, 

come mando il valore della combo box al file script.php così da poterlo inviare al database come variabile?
sto impazzendo