if (document.images)
   {
     campgroundson= new Image(100,25);
     campgroundson.src="/media/images/campgrounds_tab_selected.png";  

     campgroundsoff= new Image(100,25);
     campgroundsoff.src="/media/images/campgrounds_tab.png";

     trailheadson= new Image(100,25);
     trailheadson.src="/media/images/trailheads_tab_selected.png";  

     trailheadsoff= new Image(100,25);
     trailheadsoff.src="/media/images/trailheads_tab.png";

     tripson= new Image(100,25);
     tripson.src="/media/images/trips_tab_selected.png";  

     tripsoff= new Image(100,25);
     tripsoff.src="/media/images/trips_tab.png";
   }

function lightup(imgName)
 {
 	
   if (document.images)
    {
      var imgOn=eval(imgName + "on.src");
	  jQuery(imgName + "_tab_img").attr("src",imgOn);
    }
 }
 
var selectedTab = 'trips';

function turnoff(imgName)
 {
 	if(selectedTab != imgName)
	{
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      jQuery(imgName + "_tab_img").attr("src",imgOff);
    }
	}
 }