combo box for a existing drop down

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Javascript

PHP

MySQL

Hi all,I'm trying to enable a combo box sort of thing for an existing drop down menu but i seem to be getting no where with that.It would be wonderful if someone could help me out with this issue.

<td>
											Part Number
										</td>
										<td>
											<select class=\"".$klasse_ausw["aggregat_ausw_drpd"]."\" name=\"aggregat_ausw_drpd\"  style=\"width:90pt; size:1;\">
												<option value=></option>";

$sql_aggregat_ausw3_drpd="SELECT * FROM vers_einl_aggregatnummer ORDER BY vers_einl_aggregatnummer.aggr_nr ASC";
$result_aggregat_ausw3_drpd=mysql_query($sql_aggregat_ausw3_drpd);
while($row_aggregat_ausw3_drpd=mysql_fetch_array($result_aggregat_ausw3_drpd)){
	extract($row_aggregat_ausw3_drpd, EXTR_PREFIX_ALL, "ausw3");
	echo '										<option value="'.$ausw3_id.'"';
	if(($_POST["aggregat_ausw_drpd"]==$ausw3_id) || ($_GET["aggregat_ausw_drpd"]==$ausw3_id)){
		echo ' selected';
	}
	echo '										>'.$ausw3_aggr_nr.'</option>';
}
echo "										</select>
										</td>
									</tr>