var old;
var memold;
var subold;
if(document.layers){
 window.captureEvents(Event.MOUSEDOWN);
 window.onmousedown=do_out;
 }
else{
 document.onmouseup=do_out;       
 }
function show_layer(x){
 if(document.layers)document.layers[x].display="block";
 else document.all[x].style.display="block";
}
function hide_layer(x){
 if(document.layers)document.layers[x].display="none";
 else document.all[x].style.display="none";
 }
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;
  }
 do_submenu();
 }
function do_out(){
 if(old) hide_layer(old);
 memold=old; old="";
 do_submenu();
 }
function do_submenu(x){
 if(subold){
  hide_layer(subold);
  subold="";
  }
 if(x){
  show_layer(x);
  subold=x;
  }
 }
function bodyclick(){ hide_layer('m1x'); hide_layer('m11x');hide_layer('m12x');hide_layer('m2x');hide_layer('m13x');hide_layer('m14x');hide_layer('m15x');hide_layer('m16x');hide_layer('m17x');hide_layer('m18x');}
function bodyclick2(){ hide_layer('m1x'); hide_layer('m11x');hide_layer('m12x');hide_layer('m2x');hide_layer('m13x');hide_layer('m14x');hide_layer('m15x');hide_layer('m17x');}

function makevisible(cur,which){
if (which==0)
cur.filters.alpha.opacity=80
else
cur.filters.alpha.opacity=35
}
function newWin(url)
{
  zWin = window.open(url, 'AIRTRACK','width=600, height=550, left=100, top=0, resizable=1, scrollbars=1');
}