Turns a Javascript string into a function, can handle namespaced/contextual functions.

gistfile1.js

/**
 * Given the String "Foo.who.bar" this function returns the function bar() from the context of Foo.who
 * handy when you need to call or apply a namespaced function from a String representation.  
 */
var stringToFunction = function(str) {
  var nsArr = str.split("."),
      parentNs = window,
      len = nsArr.length;
  for (var idx = 0; idx < len; idx++) {
    parentNs = parentNs[nsArr[idx]];
  }
  return parentNs;
}

// E.g. stringToFunction("Foo.who.bar").call(window, args);