<span onclick='javascript:window.frames["框架name"].location.href="地址"'></span>
<iframe src="#" frameborder="0" scrolling="no" width="984" height="592" id="tab" name="tab"></iframe>
返回上一页：href="javascript:history.back(-1)”或onclick="javascript:history.back(-1)”或onclick="javascript:window.history.back(-1);"
过几秒钟后返回上一页代码：
<script language="javascript">setTimeout("window.history.go(-1)",3000)</script>
或者
<script language="javascript">setTimeout("history.go(-1)",3000)</script>