if (document.images) {	

   	side_menu1_on= new Image();				side_menu1_on.src="images/navigation/side_menu1b.gif"; 
   	side_menu2_on= new Image();				side_menu2_on.src="images/navigation/side_menu2b.gif";  
   	side_menu3_on= new Image();				side_menu3_on.src="images/navigation/side_menu3b.gif";  
   	side_menu4_on= new Image();				side_menu4_on.src="images/navigation/side_menu4b.gif";  
   	side_menu5_on= new Image();				side_menu5_on.src="images/navigation/side_menu5b.gif";  
   	side_menu6_on= new Image();				side_menu6_on.src="images/navigation/side_menu6b.gif";  
   	side_menu7_on= new Image();				side_menu7_on.src="images/navigation/side_menu7b.gif";  
   	side_menu8_on= new Image();				side_menu8_on.src="images/navigation/side_menu8b.gif";  
   	side_menu9_on= new Image();				side_menu9_on.src="images/navigation/side_menu9b.gif";  
   	side_menu10_on= new Image();			side_menu10_on.src="images/navigation/side_menu10b.gif";  
   	side_menu14_on= new Image();			side_menu14_on.src="images/navigation/side_menu14b.gif";  
   	side_menu15_on= new Image();			side_menu15_on.src="images/navigation/side_menu15b.gif";  
   	side_menu16_on= new Image();			side_menu16_on.src="images/navigation/side_menu16b.gif";  	

	side_menu_zh10_on= new Image(); 		side_menu_zh10_on.src="images/navigation/side_menu_zh10b.gif"; 
}