Código PHP:
<td colspan="2" bgcolor="#ffffff" id="Placa Vehiculo"><select name="vehi" id="select1" onChange="ComponerLista(document.forms.frmDatos.cliente[selectedIndex].value);" onkeyup="descuento1();">
<option selected="selected" >-- Seleccione--
</option>>
<?php $tabla = mysql_query('SELECT * FROM vehiculo ORDER BY Placa ASC');
while ($registro = mysql_fetch_array($tabla)) {
?>
<option value="<?php echo $registro['Placa'];?>">
<?php echo $registro['Placa']; ?></option>
<?php
}
mysql_free_result($tabla);?>
</select></td><