var eins= ((document.all)&&(!document.layers)) ? true : false;
var zwei= ((document.layers)&&(!document.getElementById)) ? true : false;
var drei= ((document.getElementById)&&(!document.all)) ? true : false;

function show(div){
if(eins) {document.all[div].style.visibility="visible";}
if(zwei) {document.layers[div].visibility="show";}
if(drei) {document.getElementById(div).style.visibility="visible";}
}

function hide(div){
if(eins) (document.all[div].style.visibility="hidden")
if(zwei) (document.layers[div].visibility="hide")
if(drei) (document.getElementById(div).style.visibility="hidden")
}