var _d = document;
    var interval = 80;
    
    function ById(id)
    {
        return _d.getElementById(id);
    }
    
    function ByName(name)
    {
        return _d.getElementsByName(name);
    }

    function loadFrameContent(i)
    {
        fadeOut(100,i);
    }
    
    function loadContent(op,i)
    {
        var elements = ByName('divFragen');
        ById('tdFrameContent').innerHTML = elements[i].innerHTML;
        fadeIn(op,i);
    }
    
    function fadeOut(op,i)
    {
        if(op>=10)
        {
            op-=10;
            setOpacity(op);
            window.setTimeout("fadeOut("+op+","+i+")",interval);
        }
        else
        {
            loadContent(op,i);
        }
    }
    
    function fadeIn(op,i)
    {
        if(op<100)
        {
            op+=10;
            window.setTimeout("fadeIn("+op+","+i+")",interval);
        }
        setOpacity(op);
    }
    
    function setOpacity(op)
    {
        ById('tdFrameContent').style.opacity=op/100;
        ById('tdFrameContent').style.filter = 'alpha(opacity='+op+')';
    }