code: function(r, fromLoader) {
          var i, name, mod, details, req, use, 
              mods = YUI.Env.mods,
              Y    = this,
              done = Y.Env._attached,
              len  = r.length;
  
          for (i=0; i<len; i++) {
              name = r[i]; 
              mod  = mods[name];
              if (!done[name] && mod) {
  
                  done[name] = true;
                  details    = mod.details; 
                  req        = details.requires; 
                  use        = details.use;
  
                  if (req && req.length) {
                      if (!Y._attach(req)) {
                          return false;
                      }
                  }
  
  
                  if (mod.fn) {
                      try {
                          mod.fn(Y, name);
                      } catch (e) {
                          Y.error('Attach error: ' + name, e, name);
                          return false;
                      }
                  }
  
                  if (use && use.length) {
                      if (!Y._attach(use)) {
                          return false;
                      }
                  }
              }
          }
  
          return true;
      }
docs: Executes the function associated with each required
  module, binding the module to the YUI instance.
  @method _attach
  @private