function test(x) {
  if (navigator.appName == 'Microsoft Internet Explorer') x.blur();
}

function show_layer(x) {
  if(document.layers) document.layers[x].visibility="show";
  else document.all[x].style.visibility="visible";
}

function hide_layer(x) {
  if(document.layers) document.layers[x].visibility="hide";
  else document.all[x].style.visibility="hidden";
}

var old;
var memold;
var subold;

if(document.layers) {
  window.captureEvents(Event.MOUSEDOWN);
  window.onmousedown=do_out;
} else document.onmouseup=do_out;

function do_menu(x) {
  if(!old) old=memold;
  if(old!=x) {
    show_layer(x);
    old=x;
  } else old="";
}

function do_check(x) {
  if(old && old!=x) {
    hide_layer(old);
    show_layer(x);
    old=x;
  }
}

function do_out() {
  if(old) hide_layer(old);
  memold=old; old="";
}