function TuneHeight(fm_name, fm_id) {
    var frm = document.getElementById(fm_id);
    var subWeb = document.frames ? document.frames[fm_name].document : frm.contentDocument;
    if (frm != null && subWeb != null) {
        frm.style.height = subWeb.documentElement.scrollHeight + "px";
        //如需自适应宽高，去除下行的“//”注释即可 
        //frm.style.width = subWeb.documentElement.scrollWidth+"px"; 
    }
}