Form not sending full data

I have a form with over 50 input fields. The input fields are divided into 5 jquery jabs within the form container. Here's a sample of what it looks like:

<form action="admin/save" method="post" enctype="multipart/form-data">
     <input type="hidden" name="type" value="department" />
     <input type="hidden" name="id" value="21" />
     <div id="tabs">
       <ul>
         <li><a href="#tab-1">Tab 1</a><li>
         <li><a href="#tab-2">Tab 2</a><li>
         <li><a href="#tab-3">Tab 3</a><li>
       </ul>
       <div id="tab-1">
         <label>Name</label>
         <input 开发者_开发技巧type="text" name="user-name" />
       </div>
       <div id="tab-2">
         <label>Address</label>
         <input type="text" name="user-address" />
       </div>
       <div id="tab-3">
         <label>Phone</label>
         <input type="text" name="user-phone" />
       </div>
     </div>
     <input type="submit" value="Send" />
</form>

I'm using PHP's Kohana framework, so admin maps to a controller, and save maps to the method action_save.

When I output the $_POST variables in action_save, only 'type' and 'id' show up, all the other fields don't seem to submit their data.

What could I be doing wrong?

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Have you tried this with different browsers and sniffed the network traffic to see exactly what's being sent?

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Grab Firebug and make sure it's actually sending the POST data.