function reveal(menu) {
if (document.layers) {
  visible = 'show';
  hidden = 'hide';
} else if (document.all) {
  visible = 'visible';
  hidden = 'hidden';
}
    if (document.layers) {daMenu = document.layers[menu];}
    else if (document.all) {daMenu = document.all(menu).style;}
daMenu.visibility = visible;
}

function hide(menu) {
if (document.layers) {
  visible = 'show';
  hidden = 'hide';
} else if (document.all) {
  visible = 'visible';
  hidden = 'hidden';
}
    if (document.layers) {daMenu = document.layers[menu];}
    else if (document.all) {daMenu = document.all(menu).style;} 
daMenu.visibility = hidden;
}

function hideall() {
var allmenu= new Array("collection");
  for(i = 0 ; i < allmenu.length ; i++){
      hide(allmenu[i]);}
}


if (document.layers) {
window.document.captureEvents(Event.MOUSEDOWN);
window.document.onMouseDown = hideall;
                         }