function switch_tourMenu(curr_id, total_num) {    
 for(var i=0; i<total_num; i++)     {         
     var el = document.getElementById('tourmenu_sub_'+i); 
	 var cl = document.getElementById('tour_contury_'+i);
	 if(!cl) return;  
     if(!el) return;        
     var img = document.getElementById('tourmenu_master_'+i); 
     if(i == curr_id) {   
          el.style.display = "block"; 
		  cl.style.display = "block";
          img.src = "images/tour_menu"+(i+1)+"a.jpg"; 
		  document.getElementById('tourtitle').src = "images/tour_title"+(i+1)+".jpg"; 
      } else{            
          el.style.display = "none";
		  cl.style.display = "none";
         img.src = "images/tour_menu"+(i+1)+".jpg";
     } 
  } 
}