pass multiple values from iframe to parent

Right now I can only pass Make_name..how can I pass Model too?

Parent:

[CODE]<script language=”javascript”>
function post(string){
var name=string
document.getElementById(‘make_name’).value=name;

}
</script>

<iframe src=”makemodel_dropdowns.php” height=”100px” width=”300px” frameborder=”0″>Cannot See iframe</iframe><br />

<input type=”text” id=”make_name” value=”<?php echo $make_name; ?>” name=”make”/><br />
<input type=”text” value=”<?php echo $model; ?>” name=”model”/>[/CODE]

Iframe:

[code=php]<select name=”model” onchange=”parent.post(this.form…????);” >
<option value=”default2″>Choose Model:</option>
<?php

///////// Getting the data from Mysql table for Make list//////////
$result=mysql_query(“SELECT model_name FROM models WHERE make_id =’$make_id’ ORDER BY model_name”);
///////////// End of query for Make list////////////

while($query_data = mysql_fetch_row($result)) {
?>
<option value=”<?php echo $query_data[0]; ?>”><?php echo $query_data[0]; ?></option>
<?php
}
?>
</select>

<input name=”make_name” type=”hidden” value=”<?php echo $make_name; ?>”[/code]

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