When user selected the value in dropdown the form is submitting to the XMLDOM on onchange and new value is coming from database. I want to reset with the new value. Help please

<form name="deRequest">
<select name="deInvoiceType" >
<option value='1'>1 Aluminum</option>
<option value='2'>2 Commercial</option>
<option value='3'>3 Copper</option>
<option value='4'>4 Nickel</option>
<option value='5'>5 Steel</option>
</select>

</form>