I was able to set the value of the people picker in sharepoint 2007 with chrome and firefox using:
var $MyPicker= $().SPFindPeoplePicker({ peoplePickerDisplayName: "MyFieldName", checkNames: false});
$MyPicker.row.find("textarea[id$='_downlevelTextBox']").val("foo.com\JBo");
hope this helps someone.
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