if(document.layers && !document.getElementById){
   var mycss = '<link rel="StyleSheet" type="text\/css" href="\/shared\/css\/nc4.css">';
   document.write(mycss);
}

var SharedPath = "/shared/";

var load = 0;

if(document.images){
   var BtName = new Array("", "home", "mission", "advantage", "results", "product", "access", "about", "link")
   var OnImg  = new Array();
   var OffImg = new Array();
   for(i in BtName){
      OnImg[i]  = new Image();
      OffImg[i] = new Image();
      OnImg[i].src  = SharedPath + "menu_" + BtName[i] + "_b.gif";
      OffImg[i].src = SharedPath + "menu_" + BtName[i] + "_a.gif";
   }
   var LineImg = new Image();
   LineImg.src = SharedPath + "menu_line.gif";
}

function ChBt(num, flag){
   if(load){
      document.images["BT" + num].src = (flag) ? OnImg[num].src : OffImg[num].src;
      document.images["L" + num].src = (flag) ? LineImg.src : SharedPath + "sp.gif";
   }
}