to update drop down list value when selected from website

hi help me, i want to insert value into db when i select from a drop down list, this is my code,

<div id="age">
Age 
<select name='NEW'>
<option value="">--- Select ---</option>
</div>
<?php

mysql_connect("localhost","root","") or die('could not connect to database' . mysql_error());
mysql_select_db("zero to three");
$select="zero to three";
if(isset($select)&& ($select!="")){
$select=$_POST['NEW'];
}
?>
<?php
$list=mysql_query("select * from age order by Age_Desc");
while($row_list=mysql_fetch_assoc($list)){
?>

<option value="<?php echo $row_list['Age_Id']; ?>"
<?php if($row_list['Age_Id']==$select){ echo "selected"; } ?>>
<?php echo $row_list['Age_Desc']; ?>
</option>
<?php
}
?>
</select>