if (document.layers)  {
     ns = 1; ie = 0;
} else {
     ns = 0; ie = 1;
     }

function zeigeSitemap(){
    zeigen("sitemap");
    }

function verbergeSitemap(){
    verbergen("sitemap");
    }

function zeigen(name) {
if (ns) {
    document.layers[''+name].visibility = "show";
    }
    else {
    document.all[''+name].style.visibility = "visible"
    }
}

function verbergen(name) {
if (ns){
    document.layers[''+name].visibility = "hide"
    }
    else {
    document.all[''+name].style.visibility = "hidden"
    }
}