function doIframe(){
        o = document.getElementsByTagName('iframe');
        for(i=0;i<o.length;i++){
                if (/\bautoHeight\b/.test(o[i].className)){
                        setHeight(o[i]);
                        addVambEve(o[i],'load', doIframe);
                }
        }
}

function setHeight(e){
        if(e.contentDocument){
                e.height = e.contentDocument.body.offsetHeight + 1;
        } else {
                e.height = e.contentWindow.document.body.scrollHeight;
        }
}

function addVambEve(obj, evType, fn){
        if(obj.addEventListener)
        {
        obj.addEventListener(evType, fn,false);
        return true;
        } else if (obj.attachEvent){
        var r = obj.attachEvent("on"+evType, fn);
        return r;
        } else {
        return false;
        }
}

if (document.getElementById && document.createTextNode){
 addVambEve(window,'load', doIframe);   
}