function showMoreInfo(cls)
{
    var div = document.getElementById(cls);
    var link = document.getElementById("link" + cls);

    if(div.style.display=="block")
        {
            div.style.display="none"; 
            link.innerHTML="»More statistics";
        }
    else
        {
            div.style.display="block"; 
            link.innerHTML="«Less statistics";
        }
}