function navion(box)
{        
    box.style.backgroundColor = "black";
    box.getElementsByTagName("a")[0].style.color = "white";
    var activebox = document.getElementById("naviactivebox");
    activebox.style.backgroundColor = "transparent";
    activebox.getElementsByTagName("a")[0].style.color = "black";
    
    /*box.onclick = function() 
    {
        window.location = "http://google.de";
    }*/              
}

function navioff(box)
{    
    box.style.backgroundColor = "transparent";
    box.getElementsByTagName("a")[0].style.color = "black";
    var activebox = document.getElementById("naviactivebox");
    activebox.style.backgroundColor = "black";
    activebox.getElementsByTagName("a")[0].style.color = "white";
}