表单重复提交该如何解决？

[xvyoyo]

改成retrun true时插入数据时顺序不对
我就有16分
<form action="http://<%=request.getLocalAddr()%>:<%=request.getLocalPort()%><%=request.getContextPath()%>/BusinessServlet?actionFlag=insert" method="post" name="insertForm">

<input type=submit value=submit />//submit提交
<input type="image" target="mainFrame" src="img/search.gif" name="submit" border="0" onclick="return startInsert()"/>//图片按钮提交
    <a href="BusinessServlet?actionFlag=ob"><img src="img/reset.gif" name="reset" border="0" id="reset"/></a></font>//重置

<script lanuage="javascript">
<!--
function startInsert()
{
document.insertForm.submit();

}
-->
</script>