IFrame自适应大小

    <script language="javascript" type="text/javascript">    
        function IFrameAutoFit()
        ...{
            try
            ...{
                if(window!=parent)
                ...{
                    var a = parent.document.getElementsByTagName("IFRAME");
                    for(var i=0; i<a.length; i++)
                    ...{
                        if(a[i].contentWindow == window)
                        ...{
                            var h1=0, h2=0;
                            a[i].parentNode.style.height = a[i].offsetHeight +"px";
                            a[i].style.height = "10px";
                            if(document.documentElement && document.documentElement.scrollHeight)
                            ...{
                                h1 = document.documentElement.scrollHeight;
                            }
                            if(document.body)
                            ...{
                                h2=document.body.scrollHeight;
                            }
                            var h = Math.max(h1, h2);
                            if(document.all) 
                            ...{
                                h += 4;
                            }
                            if(window.opera) 
                            ...{
                                h += 1;
                            }
                            a[i].style.height = a[i].parentNode.style.height = h +"px";
                        }
                    }
                }
            }
            catch (ex)
            ...{
            }
        }
        if(window.attachEvent)
        ...{
            window.attachEvent("onload",  IFrameAutoFit);
        }
        else if(window.addEventListener)
        ...{
            window.addEventListener('load',  IFrameAutoFit,  false);
        }    
    </script>