if (document.images)
   {
     menu_howon= new Image(93,26);
     menu_howon.src="/images/menu_how_on.png";  
     menu_howoff= new Image(93,26);
     menu_howoff.src="/images/menu_how.png";

     menu_prizeson= new Image(59,21);
     menu_prizeson.src="/images/menu_prizes_on.png";  
     menu_prizesoff= new Image(59,21);
     menu_prizesoff.src="/images/menu_prizes.png";

     menu_winnerson= new Image(63,21);
     menu_winnerson.src="/images/menu_winners_on.png";  
     menu_winnersoff= new Image(63,21);
     menu_winnersoff.src="/images/menu_winners.png";

     let_me_playon= new Image(263,118);
     let_me_playon.src="/images/let_me_play_on.png";  
     let_me_playoff= new Image(263,118);
     let_me_playoff.src="/images/let_me_play.png";

     prizeson= new Image(128,55);
     prizeson.src="/images/prizes_on.png";  
     prizesoff= new Image(128,55);
     prizesoff.src="/images/prizes.png";

     mymacson= new Image(149,49);
     mymacson.src="/images/my_macs_on.png";  
     mymacsoff= new Image(149,49);
     mymacsoff.src="/images/my_macs.png";

     menu_shell_homeon= new Image(44,19);
     menu_shell_homeon.src="/images/menu_shell_home_on.png";  
     menu_shell_homeoff= new Image(44,19);
     menu_shell_homeoff.src="/images/menu_shell_home.png";

     menu_shell_playon= new Image(44,19);
     menu_shell_playon.src="/images/menu_shell_play_on.png";  
     menu_shell_playoff= new Image(44,19);
     menu_shell_playoff.src="/images/menu_shell_play.png";

     menu_shell_howon= new Image(98,19);
     menu_shell_howon.src="/images/menu_shell_how_on.png";  
     menu_shell_howoff= new Image(98,19);
     menu_shell_howoff.src="/images/menu_shell_how.png";

     menu_shell_prizeson= new Image(54,19);
     menu_shell_prizeson.src="/images/menu_shell_prizes_on.png";  
     menu_shell_prizesoff= new Image(54,19);
     menu_shell_prizesoff.src="/images/menu_shell_prizes.png";

     menu_shell_winnerson= new Image(54,19);
     menu_shell_winnerson.src="/images/menu_shell_winners_on.png";  
     menu_shell_winnersoff= new Image(54,19);
     menu_shell_winnersoff.src="/images/menu_shell_winners.png";

     menu_static_homeon= new Image(44,20);
     menu_static_homeon.src="/images/menu_static_home_on.png";  
     menu_static_homeoff= new Image(44,20);
     menu_static_homeoff.src="/images/menu_static_home.png";	

     menu_static_howon= new Image(97,20);
     menu_static_howon.src="/images/menu_static_how_on.png";  
     menu_static_howoff= new Image(97,20);
     menu_static_howoff.src="/images/menu_static_how.png";
	  
     menu_static_prizeson= new Image(54,20);
     menu_static_prizeson.src="/images/menu_static_prizes_on.png";  
     menu_static_prizesoff= new Image(54,20);
     menu_static_prizesoff.src="/images/menu_static_prizes.png";	
	  
	  mnron= new Image(930,525);
     mnron.src="/images/alien-abduction-game-on.jpg";  
     mnroff= new Image(930,525);
     mnroff.src="/images/alien-abduction-game.jpg";	
	  
	  mnr_buttonon= new Image(263,118);
     mnr_buttonon.src="/images/end-alien-abduction-game-on.png";  
     mnr_buttonoff= new Image(263,118);
     mnr_buttonoff.src="/images/end-alien-abduction-game.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;
    }
 }