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

var i = 1;
var ebene = "street";

function zeigeStreetNr(ebene_nr){
    verbergen(eval('"' + ebene + i + '"'));
    zeigen(eval('"' + ebene + ebene_nr + '"'));
    i = ebene_nr;
    }

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

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

//---------------------------------------

var a = 100;
var b = 200;
var c = 300;
var d = 400;
var layh = "haus";
var layl = "leic";
var laya = "altp";
var lays = "spm";


function zeigeTourNr(layh_nr,layl_nr,laya_nr,lays_nr){
    hide((eval('"' + layh + a + '"')),(eval('"' + layl + b + '"')),(eval('"' + laya + c + '"')),(eval('"' + lays + d + '"')));
    show((eval('"' + layh + layh_nr + '"')),(eval('"' + layl + layl_nr + '"')),(eval('"' + laya + laya_nr + '"')),(eval('"' + lays + lays_nr + '"')));
    a = layh_nr;
    b = layl_nr;
    c = laya_nr;
    d = lays_nr;
    }

function show(namea,nameb,namec,named) {
  if (document.layers) {
    document.layers[''+namea].visibility = "show";
    document.layers[''+nameb].visibility = "show";
    document.layers[''+namec].visibility = "show";
    document.layers[''+named].visibility = "show";
    }
  else if (document.all) {
    document.all[''+namea].style.visibility = "visible";
    document.all[''+nameb].style.visibility = "visible";
    document.all[''+namec].style.visibility = "visible";
    document.all[''+named].style.visibility = "visible";
    }
  else if (document.getElementById) {
    document.getElementById(''+namea).style.visibility="visible";
    document.getElementById(''+nameb).style.visibility="visible";
    document.getElementById(''+namec).style.visibility="visible";
    document.getElementById(''+named).style.visibility="visible";
    }
}

function hide(namea,nameb,namec,named) {
  if (document.layers) {
    document.layers[''+namea].visibility = "hide";
    document.layers[''+nameb].visibility = "hide";
    document.layers[''+namec].visibility = "hide";
    document.layers[''+named].visibility = "hide";
    }
  else if (document.all) {
    document.all[''+namea].style.visibility = "hidden";
    document.all[''+nameb].style.visibility = "hidden";
    document.all[''+namec].style.visibility = "hidden";
    document.all[''+named].style.visibility = "hidden";
    }
  else if (document.getElementById) {
    document.getElementById(''+namea).style.visibility="hidden";
    document.getElementById(''+nameb).style.visibility="hidden";
    document.getElementById(''+namec).style.visibility="hidden";
    document.getElementById(''+named).style.visibility="hidden";
    }
}