are you using query for this. if yes are you using spservices ? if not try spservices jquery.
$().SPServices.SPFindPeoplePicker({
peoplePickerDisplayName: "",
valueToSet: "",
checkNames: true
});
eg and tutotials here
http://spservices.codeplex.com/wikipage?title=%24().SPServices.SPFindPeoplePicker
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