/* preload topNav tab graphics */
  
  pic1= new Image(5,100); 
  pic1.src="img_ecn/menuL_over.gif"; 

  pic2= new Image(5,100); 
  pic2.src="img_ecn/menuL_active.gif"; 

  pic3= new Image(400,100); 
  pic3.src="img_ecn/menuR_over.gif"; 
  
  pic4= new Image(400,100); 
  pic4.src="img_ecn/menuR_active.gif";