在iframe窗口中打开链接

<iframe name="a1"></iframe> 
<a href="http://www.qwbm.com/" target="a1">qwbm</a>

<iframe id="mxh"></iframe> 
<a href="http://www.lyglyw.com/" onclick="document.frames('mxh').location=this.href;return false">www.lyglyw.com</a>