if (document.images)
{
  pic1= new Image(10,20); 
  pic1.src="/images/star_off_left.png"; 

  pic2= new Image(10,20); 
  pic2.src="/images/star_off_right.png"; 

  pic3= new Image(10,20); 
  pic3.src="/images/star_on_left.png"; 

  pic4= new Image(10,20); 
  pic4.src="/images/star_on_right.png"; 

  pic5= new Image(20,20); 
  pic5.src="/images/star_on_zero.png"; 

  pic6= new Image(20,20); 
  pic6.src="/images/star_off_zero.png"; 
}