if (document.images)
{
  pic1= new Image(375,190); 
  pic1.src="../images/map.over.china2.gif"; 

  pic2= new Image(375,190); 
  pic2.src="../images/map.over.japan2.gif"; 

  pic3= new Image(375,190); 
  pic3.src="../images/map.over.mongolia2.gif"; 

  pic4= new Image(375,190); 
  pic4.src="../images/map.over.south.korea2.gif"; 

  pic5= new Image(375,190); 
  pic5.src="../images/map.over.taiwan2.gif"; 
}