var currentLayer;
var menuTimeout;
var itemTimeout;

if (document.layers || document.all || document.getElementById) {
   //menuWhyMylan
   menuImgabout_1On = new Image();  
   menuImgabout_1On.src = "/images/header/nav/why_mylan_on.gif";

   menuImgabout_1Off = new Image();   
   menuImgabout_1Off.src = "/images/header/nav/why_mylan_off.gif";
   
   
   
   //menuJoinMylan
   menuImgJoin_1On = new Image();   
   menuImgJoin_1On.src = "/images/header/nav/join_mylan_on.gif";  

   menuImgJoin_1Off = new Image();  
   menuImgJoin_1Off.src = "/images/header/nav/join_mylan_off.gif";
  
   
   
    //menuFaq
   menuImgFaq_1On = new Image();  
   menuImgFaq_1On.src = "/images/header/nav/faq_on.gif";  
   
   menuImgFaq_1Off = new Image();   
   menuImgFaq_1Off.src = "/images/header/nav/faq_off.gif";
 }
  

function showLayer(div) {
   if (document.layers) {
      eval('document.layers["' + div + '"].visibility = "visible";');
   } else if (document.all) {
      document.all[div].style.visibility = "visible";
   } else if (document.getElementById) {
      document.getElementById(div).style.visibility = "visible";
   }
}

function hideLayer(div) {
   if (document.layers) {
      eval('document.layers["' + div + '"].visibility = "hidden";');
   } else if (document.all) {
      document.all[div].style.visibility = "hidden";
   } else if (document.getElementById) {
      document.getElementById(div).style.visibility = "hidden";
   }
}

function menuOn(div) {
   if (document.layers || document.all || document.getElementById) {
      if (currentLayer) {
         if (menuTimeout) clearTimeout(menuTimeout);
         if (itemTimeout) clearTimeout(itemTimeout);
         hideLayer(currentLayer);
      }
      showLayer(div);
      currentLayer = div;
   } else {
      swapImage('menu',div);
   }
}

function menuOff(div) {
   if (document.layers || document.all || document.getElementById) {
      menuTimeout = setTimeout('hideLayer(currentLayer)',600);
   } else {
      swapImage('menu','dots');
   }
}

function keepAlive(div) {
   if (menuTimeout) clearTimeout(menuTimeout);
   if (itemTimeout) clearTimeout(itemTimeout);
   showLayer(div);
}

function killIt(div) {
   itemTimeout = setTimeout('hideLayer(currentLayer)',600);
}