if (document.images)
{
  flyer01= new Image(390,460); 
  flyer01.src="images/flyer_01.jpg"; 

  flyer02= new Image(390,460); 
  flyer02.src="images/flyer_02.jpg"; 

  flyer03= new Image(390,460); 
  flyer03.src="images/flyer_03.jpg"; 
  
  flyer04= new Image(390,460); 
  flyer04.src="images/flyer_04.jpg"; 
}