多個提交按鈕在同一表單內的處理方式

 // 補充程式碼
<表單方法="POST" onsubmit ="return ad.checkform(this);return false;" >
       .....
       .....
    <a href="javascript:void(0);" onclick="this.parentNode.submit();">
       < input type ="submit" onclick ="this.form.target='_blank'" name ="preview" value ="預覽" >
       < input type ="submit" onclick ="this.form.target='_self'" name ="save" value ="儲存" >
</表格>