var IE4 = document.all; NS4 = document.layers; NS6 = document.getElementById;
function getStyle(id){return NS4 ? document[id] : NS6 ? document.getElementById(id).style : document.all[id].style;}
function hideDiv(id){getStyle(id).visibility = NS4 ? "hide" : "hidden";}
function showDiv(id){getStyle(id).visibility = NS4 ? "show" : "visible";}
function HideLayer(layer){hideDiv(layer);}
function ShowLayer(layer){showDiv(layer);}