ie4 = ((navigator.appName == "Microsoft Internet Explorer") && 
(parseInt(navigator.appVersion) >= 4 ));
function rolldown( object )
{ if (ie4) {
roller= document.all(object);
if (roller.style.display == "none")
{ roller.style.display = ""; } 
else 
{ roller.style.display = "none"; } }}

function menuup(object){
roller= document.all(object);
roller.style.display = "none";
}