gistfile1.js

function(path) {
  var paths = path.split('.'),
      current = window,
      i, len;
      
  len = paths.length;
  
  for (i = 0; i < len; ++i) {
      if (current[paths[i]] == undefined) {
          return undefined;
      } else {
          current = current[paths[i]];
      }
  }
  return current;
}