function autoResize(id){
    var newheight;

    if (!window.opera && !document.mimeType && document.all && document.getElementById){
        newheight=document.getElementById(id).contentWindow.document .body.offsetHeight;
    }else if(document.getElementById){
        newheight=document.getElementById(id).contentWindow.document .body.scrollHeight;
    }

    document.getElementById(id).height= (newheight + 16) + "px";
}