js form action动态修改方法

<script language="JavaScript" >
function checkaction(v){
if(v==0){
document.dbform.action="index.php?admin_db-repair";
}else{
document.dbform.action="index.php?admin_db-optimize";
}
dbform.submit();
}
</script>
<form action="" method="post" name="dbform">
<input type="submit" class="btn" value="{lang dbStartOptimize}" name="opsubmit" onclick="checkaction(1);" />
<input type="submit" class="btn" value="{lang dbStartFix}" name="resubmit" onclick="checkaction(0);" />
</form>