if (document.images)
   {
     myspaceon= new Image(141,64);
     myspaceon.src="images/myspace_on.png";  
     myspaceoff= new Image(141,64);
     myspaceoff.src="images/myspace.png";

     facebookon= new Image(132,64);
     facebookon.src="images/facebook_on.png";  
     facebookoff= new Image(132,64);
     facebookoff.src="images/facebook.png";

     buy1on= new Image(150,61);
     buy1on.src="images/buy_tickets_on.png";  
     buy1off= new Image(150,61);
     buy1off.src="images/buy_tickets.png";

     buy2on= new Image(150,61);
     buy2on.src="images/buy_tickets_on.png";  
     buy2off= new Image(150,61);
     buy2off.src="images/buy_tickets.png";

     buy3on= new Image(150,61);
     buy3on.src="images/buy_tickets_on.png";  
     buy3off= new Image(150,61);
     buy3off.src="images/buy_tickets.png";

     buy4on= new Image(150,61);
     buy4on.src="images/buy_tickets_on.png";  
     buy4off= new Image(150,61);
     buy4off.src="images/buy_tickets.png";

     nav_homeon= new Image(227,118);
     nav_homeon.src="images/nav_home_on.png";  
     nav_homeoff= new Image(227,118);
     nav_homeoff.src="images/nav_home.png";

     nav_touron= new Image(175,118);
     nav_touron.src="images/nav_tour_on.png";  
     nav_touroff= new Image(175,118);
     nav_touroff.src="images/nav_tour.png";

     nav_abouton= new Image(214,118);
     nav_abouton.src="images/nav_about_on.png";  
     nav_aboutoff= new Image(214,118);
     nav_aboutoff.src="images/nav_about.png";

     nav_awardson= new Image(210,118);
     nav_awardson.src="images/nav_awards_on.png";  
     nav_awardsoff= new Image(210,118);
     nav_awardsoff.src="images/nav_awards.png";

     nav_newson= new Image(183,118);
     nav_newson.src="images/nav_news_on.png";  
     nav_newsoff= new Image(183,118);
     nav_newsoff.src="images/nav_news.png";
}

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }