if (document.images) {	

	side_menu1_off= new Image(); 			side_menu1_off.src="images/navigation/side_menu1a.gif";
	side_menu2_off= new Image(); 			side_menu2_off.src="images/navigation/side_menu2a.gif"; 
	side_menu3_off= new Image(); 			side_menu3_off.src="images/navigation/side_menu3a.gif"; 
	side_menu4_off= new Image(); 			side_menu4_off.src="images/navigation/side_menu4a.gif";
	side_menu5_off= new Image(); 			side_menu5_off.src="images/navigation/side_menu5a.gif";
	side_menu6_off= new Image(); 			side_menu6_off.src="images/navigation/side_menu6a.gif"; 
	side_menu7_off= new Image(); 			side_menu7_off.src="images/navigation/side_menu7a.gif";
	side_menu8_off= new Image(); 			side_menu8_off.src="images/navigation/side_menu8a.gif";
	side_menu9_off= new Image(); 			side_menu9_off.src="images/navigation/side_menu9a.gif"; 
	side_menu10_off= new Image(); 			side_menu10_off.src="images/navigation/side_menu10a.gif"; 
	side_menu14_off= new Image(); 			side_menu14_off.src="images/navigation/side_menu14a.gif"; 
	side_menu15_off= new Image(); 			side_menu15_off.src="images/navigation/side_menu15a.gif"; 
	side_menu16_off= new Image(); 			side_menu16_off.src="images/navigation/side_menu16a.gif";		

	side_menu_zh10_off= new Image(); 		side_menu_zh10_off.src="images/navigation/side_menu_zh10a.gif"; 
}