if (document.images)
{
  pic1= new Image(180,285); 
  pic1.src="images/map.over.argentina.gif"; 
		
  pic2= new Image(180,285); 
  pic2.src="images/map.over.brazil.gif"; 

  pic3= new Image(180,285); 
  pic3.src="images/map.over.chile.gif"; 
}