Sortable: tables and Firefox

I 've trying to figure how to work with tables and sortable objects.
The code above works well at IE, but in Firefox i cant make it work...
Does anyone know any kind od restrictions between FF and Scriptaculous?

<script type="text/javascript" src="../../javascript/prototype.js"
<script type="text/javascript"

<table border=1 style="position:relative;" >
  <tr id="linha">
    <td id="0">Nome</td>
    <td class="1" style='cursor: move;' id="1">Campo 1</td>
    <td class="1" style='cursor: move;' id="2">Campo 2</td>
    <td class="1" style='cursor: move;' id="3">Campo 3</td>
    <td class="1" style='cursor: move;' id="4">Campo 4</td>
  <tr align="center" id="linha3">
    <td>Nome simples</td>
  <tr align="center" id="linha4">
    <td>Nome simples</td>

<script type="text/javascript">
// <![CDATA[
// ]]>