Mobile Safari form label to input focusing

gistfile1.js

// For use in jQuery

// Some mobile browsers (ie. Mobile Safari) don't focus their associated inputs
// so we force that behavior when possible.
$('label[for]')
  // First we check when a label is touched and is associated with a radio or checkbox input,
  // if so then we mark it as having focus.
  .live('touchstart', function(event) {
    var input = event.target.control ? $(event.target.control) : $('#' + event.target.htmlFor);
    if (input.is('[type=checkbox], [type=radio]'))
      input.focus();
  })
  // Should the user move via touch on the label instead of pressing on the label we blur the
  // focus on the input if it's a radio or checkbox. This is to avoid misinterpreting a scroll
  // for a press.
  .live('touchmove', function(event) {
    var input = event.target.control ? $(event.target.control) : $('#' + event.target.htmlFor);
    if (input.is('[type=checkbox], [type=radio]'))
      input.blur();
  })
  // If the press is finished and we still have focus on the radio or checkbox inputs then
  // trigger a click event which will do the rest. Focus all other input types.
  .live('touchend', function(event) {
    var input = event.target.control ? $(event.target.control) : $('#' + event.target.htmlFor);
    if (input.is('[type=checkbox], [type=radio]'))
      if (input.is(':focus')) input.click();
    else
      input.focus();
  });