Execute function with string. Source: http://stackoverflow.com/questions/359788/how-to-execute-a-javascript-function-when-i-have-its-name-as-a-string

func-string.js

// Simple execution
window["functionName"](arguments);

// Nested exection.
window["My"]["Namespace"]["functionName"](arguments);

// Helper function.
function executeFunctionByName(functionName, context /*, args */) {
  var args = Array.prototype.slice.call(arguments).splice(2);
  var namespaces = functionName.split(".");
  var func = namespaces.pop();
  for(var i = 0; i < namespaces.length; i++) {
    context = context[namespaces[i]];
  }
  return context[func].apply(this, args);
}

executeFunctionByName("My.Namespace.functionName", window, arguments);