/* Wird benötigt für den IE6 und älter */
function showHGM2(element){
    element.className += "hover";
    var reTable = document.getElementById("sub_navi").style.visibility;
    if(reTable == "visible"){
        document.getElementById("sub_navi").style.visibility = "hidden";
    }else{
        document.getElementById("sub_navi").style.visibility = "hidden";
    }
}
function hideHGM2(element){
    element.className = element.className = "";
    var reTable = document.getElementById("sub_navi").style.visibilty;
    if(reTable == "hidden"){
        document.getElementById("sub_navi").style.visibility = "visible";
    }else{
        document.getElementById("sub_navi").style.visibility = "visible";
    }
}