The following is the content of the main page:

        <script type="text/javascript">
            function changeFrameHeight(){
                var ifm= document.getElementById("iframepage");
                ifm.height=document.body.clientHeight + 50;
            }
            window.onresize=function(){  
                 changeFrameHeight();
            } 
        </script>
        <p id="tt">
            <p title="首页">
                <iframe src="page/home.html" id="iframepage"  onload="changeFrameHeight()"  style="width:100%;" scrolling="no" frameborder="0"></iframe>
            </p>
        </p>

When the page is zoomed out, all the contents of home.html cannot be displayed. How should I change it?