iframe设置宽与高

<iframe width="100%" align="center" height="200" id="frame" name="frame" frameborder="0" scrolling="no" onload="Javascript:SetWinHeight(this)"></iframe>     

 function SetWinHeight(obj) {
            var win = obj;
            if (document.getElementById) {
                if (win && !window.opera) {
                    if (win.contentDocument && win.contentDocument.body.offsetHeight)
                        win.height = win.contentDocument.body.offsetHeight;
                    else if (win.Document && win.Document.body.scrollHeight)
                        win.height = win.Document.body.scrollHeight;
                }
            }
        }