if (document.images)
   {
     image_off= new Image(245,176);
     image_off.src="images/rowing.jpg";
     image1 = new Image(245, 176);
     image1.src = "images/arts.jpg";
     image2= new Image(245,176);
     image2.src="images/sports.jpg";
     image3= new Image(245,176);
     image3.src="images/tutoring.jpg";  
     image4= new Image(245,176);
     image4.src="images/meals.jpg";   
     image5= new Image(245,176);
     image5.src="images/science.jpg";  
   }

function change1(picName,imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + ".src");
      document[picName].src= imgOn;
    }
 }