var ns4 = document.layers;
var ie4 = document.all;
var ns6 = ((document.getElementById)&&(!(ie4)));

function showObj(objet){
 if (ns4) { objet.visibility = 'show'; }
 else  if ((ie4)||(ns6)) { objet.style.visibility = 'visible'; };
}

function hideObj(objet){
 if (ns4) { objet.visibility = 'hide'; }
 else  if ((ie4)||(ns6)) { objet.style.visibility = 'hidden'; };
}

function GetMyObject(strObj){
 var obj;
 if (ns4) { obj = eval('document.' + strObj); }
  else
    {
       if (ie4) { obj = eval('document.all.' + strObj); };
	   if (ns6) { obj = document.getElementById(strObj);};
	 };
 return obj;
}

function hideAll(){
for(var u=0;u<10;u++)
 {
   var calk = GetMyObject('menu' + u);
   hideObj(calk);
  };
}

function showMenu(i){// showMenu : NS4+ , IE4+
hideAll();
var div = GetMyObject('menu'+i);
showObj(div);
}

function hideMenu(i){// hideMenu : NS4+ , IE4+
var div = GetMyObject('menu'+i);
hideObj(div);
}