2.在body中加两个属性
<body topmargin="0" leftmargin="0">

解决方案 »

  1.   

    看看这个例子
    <body topmargin="0" leftmargin="0">
    <iframe src="http://expert.csdn.net/Expert/topic/2931/2931847.xml?temp=.3843653" width="100%" height="5%" name="menutopFrame" scrolling="NO"  onMouseOver="this.style.height='25%'" onMouseOut="this.style.height='5%'" frameborder="0"></iframe>
    <iframe src="http://expert.csdn.net/Expert/topic/2931/2931847.xml?temp=.3843653" width="100%"  height="95%" name="MainFrame" scrolling="NO"  onMouseOver="this.style.height='95%'" onMouseOut="this.style.height='75%'" frameborder="0"></iframe>
    </body>
      

  2.   

    1。问题不存在
    2。<body topmargin="0" leftmargin="0">