select onchange 赋值方法

<select name="province" id="province" class="seld" onchange="window.location.href=('yunfei_dblist.php?province='+(this.value))">
<option>--请选择省份--</option>
<?php
$sqlpr = mysql_query("select * from `expenses_debang` where cat=0",$conn);
while($rowpr = mysql_fetch_array($sqlpr)){
?>
<option value="<?php echo $rowpr['province'];?>"><?php echo $rowpr['province'];?></option>
<?php
}
?>
</select>