function popupLarge(){
  var x=364;
  var y=380;
  var xPos = Math.round( (screen.width/2) - (x/2) ) + 80;
  var yPos = Math.round( (screen.height/2) - (y/2) );
  var winIntro =
  window.open('','popup','location=no,menubar=no,toolbar=no,resizable=yes,scrollbars=yes,width=' + x + ',height=' + y + ',left=' + xPos + ',top=' +yPos + ',screenX=' + xPos + ',screenY=' + yPos, true);
  }

  fValidVer = 
   (((navigator.appName == "Netscape") && 
   (parseInt(navigator.appVersion) >= 3 )) || 

   ((navigator.appName == "Opera") && 
   (parseInt(navigator.appVersion) >= 6 )) ||

   ((navigator.appName == "Microsoft Internet Explorer") && 
   (parseInt(navigator.appVersion) >= 4 )));
  if (document.images){
   <!--BUTTONS-->
   var infosm_normal = new Image;
   infosm_normal.src = "Images/button_infosm_normal.gif";
   var infosm_hover = new Image;
   infosm_hover.src = "Images/button_infosm_hover.gif";

   var lakesuccess_normal = new Image;
   lakesuccess_normal.src = "Images/button_lakesuccess_normal.gif";
   var lakesuccess_hover = new Image;
   lakesuccess_hover.src = "Images/button_lakesuccess_hover.gif";

   var localparks_normal = new Image;
   localparks_normal.src = "Images/button_localparks_normal.gif";
   var localparks_hover = new Image;
   localparks_hover.src = "Images/button_localparks_hover.gif";

   var nationalparks_normal = new Image;
   nationalparks_normal.src = "Images/button_nationalparks_normal.gif";
   var nationalparks_hover = new Image;
   nationalparks_hover.src = "Images/button_nationalparks_hover.gif";

   var monument_normal = new Image;
   monument_normal.src = "Images/button_monument_normal.gif";
   var monument_hover = new Image;
   monument_hover.src = "Images/button_monument_hover.gif";
   
   var poi_normal = new Image;
   poi_normal.src = "Images/button_poi_normal.gif";
   var poi_hover = new Image;
   poi_hover.src = "Images/button_poi_hover.gif";
   
   var historicalsites_normal = new Image;
   historicalsites_normal.src = "Images/button_historicalsites_normal.gif";
   var historicalsites_hover = new Image;
   historicalsites_hover.src = "Images/button_historicalsites_hover.gif";   

   var localevents_normal = new Image;
   localevents_normal.src = "Images/button_localevents_normal.gif";
   var localevents_hover = new Image;
   localevents_hover.src = "Images/button_localevents_hover.gif";

   var top_normal = new Image;
   top_normal.src = "Images/button_top_normal.gif";
   var top_hover = new Image;
   top_hover.src = "Images/button_top_hover.gif";
  }

  function Swap(image1, image2) {
   if (document.images)
        document.images[image1].src = eval(image2 + ".src");
  }