Pass a dot separated string representation of a method (e.g. "MyApp.Utilities.calculateSomething") to be called on the window without using eval.

runAction.js

/** 
 * Given a string, such as "MyNamespace.MyClass.MyMethod",
 * this function will check for and execute a corresponding
 * method on the window.
 */
function runAction(action) {
  var pieces = action.split('.');
  var pieceCount = pieces.length;
  var base = window;
  
  for (var i = 0; i < pieceCount; i++) {
    var piece = pieces[i];
    
    if (i + 1 < pieceCount) {
      // All but the last piece should be objects
      if (typeof base[piece] != 'undefined') {
        base = base[piece];
      } else {
        console.log("Function could not be found.");
        break;
      }
    } else {
      // The last piece should be a function we can call
      if (typeof base[piece] == 'function') {
        base[piece](); // Call the function if it exists on this object
      }
    } // end if last piece
  } // end for each piece
}