// JavaScript Document
  function show(number){
    
    if(document.getElementById('submenu_' + number)) {
      var obj = document.getElementById('submenu_' + number);
      if(obj.style.display != 'block'){
        hideAll();
        obj.style.display = 'block';
      }
      else hideAll();
      return true;
    }
      
    
  }
  //sets all css display attributes to 'none' -> hides all submenus
  function hideAll(){
    for(i = 1; i <= 15; i++) {
      if(document.getElementById('submenu_' + i)) {
        document.getElementById('submenu_' + i).style.display = 'none';
      }
    }
    return true;
  }