b.html
---------------------------------------
<html>
<frameset cols="25%,50%,25%">
           <frame src="a.htm" name="a">
           <frame src="b.htm" name="b">
           <frame src="c.htm" name="c">
</frameset>
</html>

-------------------------------------------------------------------------------



a.htm
--------------------------------------------
<html>
<body>
<a href="#" onclick='window.open("http://www.baidu.com","b"); window.open("http://www.google.com","c")'>me</a>
</body>
</html>