if (document.images) { 

var img00 = new Image(); 
img00.src = "images/dark-green.jpg"; 

var img1 = new Image(); 
img1.src = "images/dark-green.jpg"; 

var img2 = new Image(); 
img2.src = "images/dark-green-II.jpg"; 

var img3 = new Image(); 
img3.src = "images/dark-green-III.jpg"; 

var img4 = new Image(); 
img4.src = "images/driving-home.jpg"; 

var img5 = new Image(); 
img5.src = "images/freedom.jpg"; 

var img6 = new Image(); 
img6.src = "images/looking-inside.jpg"; 

var img7 = new Image(); 
img7.src = "images/my-place.jpg"; 

var img8 = new Image(); 
img8.src = "images/we-passed.jpg"; 

var img9 = new Image(); 
img9.src = "images/sleepingbeautyI.jpg"; 

var img10 = new Image(); 
img10.src = "images/weepingwillowII.jpg"; 

var img11 = new Image(); 
img11.src = "images/landscape.jpg"; 

var img12 = new Image(); 
img12.src = "images/horizonI.jpg"; 

var img13 = new Image(); 
img13.src = "images/inthenews.jpg"; 

var img14 = new Image();
img14.src = "images/mountain.jpg";

var img15 = new Image();
img15.src = "images/oldtree.jpg";

var img16 = new Image();
img16.src = "images/sleepingbeautyII.jpg";

var img17 = new Image();
img17.src = "images/weepingwillowI.jpg";

var img18 = new Image();
img18.src = "images/horizonII.jpg";

} 


function On(name) { 

if (document.images) { 
document.images['def'].src = eval(name + '.src'); 
} 

} 


function Off() { 

if (document.images) { 
document.images['def'].src = img0.src; 
} 

}