Reset password form pre-populates

I'm making an HTML form with a reset password, but firefox pre-populates the entry.

I want it to remain blank. Only if the user alters the form by hand should it stop being blank.

Suggestions?

 

I thought it was autocomplete="off", but that doesn't seem to prevent it.

 

var genericAutocomplete = {
off : function(srcInputID) {
var tag = document.getElementById(srcInputID)
if (tag) {
tag.value = '';
}
} //end of turnOff
} //end of genericAutocomplete

window.setTimeout("genericAutocomplete.off('password')",50);

http://blog.primalskill.com/?p=17