di_orig = new Image;
  di_orig.src = "images/MdisA.jpg";
  di_over = new Image;
  di_over.src = "images/MdisB.jpg";
  
  ph_orig = new Image;
  ph_orig.src = "images/MphysA.jpg";
  ph_over = new Image;
  ph_over.src = "images/MphysB.jpg";
  
  ch_orig = new Image;
  ch_orig.src = "images/MchemA.jpg";
  ch_over = new Image;
  ch_over.src = "images/MchemB.jpg";
  
  an_orig = new Image;
  an_orig.src = "images/ManalA.jpg";
  an_over = new Image;
  an_over.src = "images/ManalB.jpg";
  
  pp_orig = new Image;
  pp_orig.src = "images/MppsA.jpg";
  pp_over = new Image;
  pp_over.src = "images/MppsB.jpg";
  
  con_orig = new Image;
  con_orig.src = "images/MconA.jpg";
  con_over = new Image;
  con_over.src = "images/MconB.jpg";
  
  pt_orig = new Image;
  pt_orig.src = "images/MpetA.jpg";
  pt_over = new Image;
  pt_over.src = "images/MpetB.jpg";

 com_com = new Image;
 com_com.src = "images/space05.gif";
 
 add_cart1 = new Image;
 add_cart1.src = "images/Add.jpg";
 checkout1 = new Image;
 checkout1.src = "images/Checkout.jpg";

 add_cart2 = new Image;
 add_cart2.src = "images/Add2.jpg";
 checkout2 = new Image;
 checkout2.src = "images/Checkout2.jpg";