function MM_showHideLayers() {
if (document.getElementById)
{
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) {
v=args[i+2]; /* this code should not change into the format
i<(args.length-1); i+=2)... v=args[i+1], because the changed script doesn't then work in MS IE 5.0 for Windows */
{
var Cmenu = document.getElementById(args[i]); v=(v=='show')?'visible':(v='hide')?'hidden':v; Cmenu.style.visibility = v;
} 
} } else {}/* the formal termination, which is not necessary */
}