Set Unresolved Email in party List using Java Script

function setUnresolvedRecipient(unresolvedemail) {
        var obj = new Object(); //create the unresolved object
        obj.name = unresolvedemail;
        obj.category = 3;
        obj.data = unresolvedemail;
        obj.type = "9206";
        var toField = Xrm.Page.getAttribute("to");
        var toValue = toField.getValue();
        if (toValue != null) {
            toValue.push(obj); //if there are already other values, add to it
            toField.setValue(toValue);
        }
        else {
            toField.setValue([obj]); //if 'to' field is null, just override it
        }       
}