<head> <script type="text/JavaScript"> <!-- function ChangeIFrame(CIF1,CIF2) { parent.leftframe.location.href = CIF1; parent.rightframe.location.href = CIF2; } //--> </script> </head> <body> <p><a href="javascript:ChangeIFrame('sub.html','main.html')">ここ</a>をクリックすると左右が入れ替わります。</p> <iframe name="leftframe" src="main.html" frameborder="0" marginwidth="5" marginheight="5" scrolling="yes" align="left"