function fnHeight(){
    var notheight = document.getElementById('notices').offsetHeight;
    document.getElementById('notice_height').style.height = notheight - 77 + 'px';
        var sideheight = document.getElementById('sidebar').offsetHeight;
        var contheight = document.getElementById('content').offsetHeight;
        if (sideheight>contheight)
        {
        document.getElementById('content').style.height = sideheight + 'px';
        }
}