iframe自动增长

<iframe width="978" align="center" height="200" id="win" name="win" onload="Javascript:SetWinHeight(this)" frameborder="0" scrolling="no" src="MyAccount"></iframe>

js代码

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;
            }
        }
    }