Disabling autocomplete in Firefox 2

The ff. works in Firefox 3 but not in Firefox 2. Anyone know why and if there is a work-around?

<input name="pin" t开发者_JS百科ype="password" autocomplete="off" />

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Found this http://forums.mozillazine.org/viewtopic.php?t=289077. Seems that setting this attrib to off disables the saving of the data but not the retrieval. In my case, the data had already been saved before I introduced the attribute so it was still displayed.