var amenue=0;
var timerID = null;
var timerOn = false;

function getObject(name) {
var obj;
  
  if (document.layers) {
  obj=eval("document.layers[\'"+name+"\']");
   return obj;
   }
     else if (document.all) {
     obj=eval("document.all[\'"+name+"\']");
     return obj;
  	 }
	   else if (document.getElementById(name)) {
       obj=document.getElementById(name);
       return obj;
  	   }
}

function showlayer(which) {
Obj = getObject(which);
  
  if (Obj) {
	if (Obj.style) { 
    Obj.style.visibility = "visible";
    }
	  else if (Obj.visibility) {
      Obj.visibility="show"; 
      }
  } 

}

function hidelayer(which) {
Obj = getObject(which);
  
  if (Obj.style){
  Obj.style.visibility = "hidden";
  }
    else if(Obj.visibility){
	Obj.visibility="hide";
	}		

}

function showMenu(menu) {
stopTime();
  if (amenue)	hidelayer(amenue); 
showlayer(menu);
amenue=menu;
}

function hideMenu() {
  if (amenue) hidelayer(amenue);
amenue = 0;
}

function stopTime() {
  if (timerOn) {
  clearTimeout(timerID);
  timerID = null;
  timerOn = false;
  }
}

function startTime() {
  if (timerOn == false) {
  timerID = setTimeout('hideMenu()',50);
  timerOn = true;
  }
}