function show(x){
if(document.layers)// NN 4.x
{
document.layers[x].visibility="visible";
}
if (document.all && !document.getElementById) // IE 4
{
document.all[x].style.visibility="visible";
}
if (document.getElementById) // IE 5.x und NN 6
{
document.getElementById(x).style.visibility="visible";
}
}


function hide(x){ 
if(document.layers)// NN 4.x
{
document.layers[x].visibility="hidden";
}
if (document.all && !document.getElementById) // IE 4
{
document.all[x].style.visibility="hidden";
}
if (document.getElementById) // IE 5.x und NN 6
{
document.getElementById(x).style.visibility="hidden";
}
}

function show_all(x, y)
{show(x);
 show(y);
 }
 
 function hide_all(x, y)
 {hide(x);
  hide(y);
 }