一个表单两个提交按钮的实现

script language="JavaScript" type="text/JavaScript">
<!--
function preview() { //v3.0
  document.Newtheme.action="preview.asp";document.Newtheme.target="_blank";}

function formok() { //v3.0
  document.Newtheme.action="";document.Newtheme.target="_self";}
//-->

</script>


<form name="Newtheme" method="post" action="">
      <input type="submit" name="Submit" value="发表新主题" οnclick="formok()">
      &nbsp;&nbsp;&nbsp;
      <input type="submit" name="Submit" value="预览新主题" onClick="preview()">

</form>