function hide_menu(divId)
    {
    if (document.layers)
         { document.layers[divId].visibility = 'hide'; 
           document.layers[divId+"_href"].className = 'level1'; 
        }
         
    else if (document.getElementById)
         { 
           if (document.getElementById(divId)) {
              document.getElementById(divId).style.visibility = 'hidden';
           }
           if (document.getElementById(divId+"_href")) {
             document.getElementById(divId+"_href").className = 'level1';
           }
         }
    else if (document.all)
         { document.all[divId].style.visibility = 'hidden'; 
           document.all[divId+"_href"].className = 'level1';
         }
         
    }
    
function show_menu(divId)
    {
    hide_all();
    if (document.layers)
         { document.layers[divId].visibility = 'show'; 
           document.layers[divId+"_href"].className = 'level1_a'; 
          }
         
    else if (document.getElementById)
         {  
           if (document.getElementById(divId)) {
              document.getElementById(divId).style.visibility = 'visible'; 
           }
           if (document.getElementById(divId+"_href")) {
             document.getElementById(divId+"_href").className = 'level1_a'; 
           }
          }
    else if (document.all)
         { document.all[divId].style.visibility = 'visible'; 
           document.all[divId+"_href"].className = 'level1_a';
         }
         
    } 
 
  
 
function hide_all() {
//  hide_menu("m1");
//  hide_menu("m2");
}