var ie = document.all ? 1 : 0;
var ns = document.layers ? 1 : 0;
var mac = ((navigator.appVersion.indexOf("Mac") != -1)) ? 1 : 0;
var pc = ((navigator.appVersion.indexOf("Mac") == -1)) ? 1 : 0;

function newImage(arg)
  {
  if (document.images)
    {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
    }
  }

function changeImages()
  {
  if (document.images && (preloadFlag == true))
    {
    for (var i=0; i<changeImages.arguments.length; i+=2)
      {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1]).src;
      }
    }
  }

function openNewWin(theURL,winName,features) 
  {
  window.open(theURL,winName,features);
  }

var preloadFlag = false;

  if (document.images)
    {
    // preload navigation button images
    homeSt = newImage("images/navbut/home.gif");
    homeOv = newImage("images/navbut/homeov.gif");
    visitorSt = newImage("images/navbut/visitor.gif");
    visitorOv = newImage("images/navbut/visitorov.gif");
    entertainmentSt = newImage("images/navbut/entertainment.gif");
    entertainmentOv = newImage("images/navbut/entertainmentov.gif");
    shoppingSt = newImage("images/navbut/shopping.gif");
    shoppingOv = newImage("images/navbut/shoppingov.gif");
    servicesSt = newImage("images/navbut/services.gif");
    servicesOv = newImage("images/navbut/servicesov.gif");
    informationSt = newImage("images/navbut/information.gif");
    informationOv = newImage("images/navbut/informationov.gif");
	
    expSt = newImage("images/pages_bottom_r1_c1.gif");
    expbackOv = newImage("images/pages_bottom_r1_c1_f2.gif");
    expgoupOv = newImage("images/pages_bottom_r1_c1_f3.gif");
    expdirOv = newImage("images/pages_bottom_r1_c1_f4.gif");
    backSt = newImage("images/pages_bottom_r1_c2.gif");
    backOv = newImage("images/pages_bottom_r1_c2_f2.gif");
    goupSt = newImage("images/pages_bottom_r1_c3.gif");
    goupOv = newImage("images/pages_bottom_r1_c3_f2.gif");
    dirSt = newImage("images/pages_bottom_r1_c4.gif");
    dirOv = newImage("images/pages_bottom_r1_c4_f2.gif");
    preloadFlag = true;
    }