Expanding on Nudel's answer you can use the following button to perform this rename on selected files:
<?xml version="1.0"?>
<button backcol="none" display="both" textcol="none">
<label>Remove 00's</label>
<icon1>#rename</icon1>
<function type="normal">
<instruction>Rename FROM 00* TO *</instruction>
</function>
</button>
(If you don't understand the code block above, see the faq).