function loadimg(imgname){
if (document.images) (new Image()).src = imgname;}
loadimg("main_img/menu_home_02.gif"); 
loadimg("main_img/menu_home_03.gif"); 
loadimg("main_img/menu_trt_02.gif"); 
loadimg("main_img/menu_trt_03.gif"); 
loadimg("main_img/menu_clinic_02.gif"); 
loadimg("main_img/menu_clinic_03.gif"); 
loadimg("main_img/menu_dir_02.gif"); 
loadimg("main_img/menu_dir_03.gif"); 
loadimg("main_img/menu_acc_02.gif"); 
loadimg("main_img/menu_acc_03.gif"); 
loadimg("main_img/menu_link_02.gif"); 
loadimg("main_img/menu_link_03.gif");