//Javascript

if (document.images)
   {
     pic1= new Image(156,28); 
     pic1.src="assets/images/btn1_off.jpg"; 
   
     pic2= new Image(156,28); 
     pic2.src="assets/images/btn1_on.jpg"; 
   
     pic3= new Image(156,28); 
     pic3.src="assets/images/btn2_off.jpg"; 
   
     pic4= new Image(156,28); 
     pic4.src="assets/images/btn2_on.jpg"; 
     
     pic5= new Image(156,28); 
     pic5.src="assets/images/btn3_off.jpg"; 
   
     pic6= new Image(156,28); 
     pic6.src="assets/images/btn3_on.jpg"; 
   
     pic7= new Image(156,28); 
     pic7.src="assets/images/btn4_off.jpg"; 
   
     pic8= new Image(156,28); 
     pic8.src="assets/images/btn4_on.jpg"; 
  }