Event tracking with Google Analytics and LaunchRock.

track.js

function conversion(){
  var tracker = _gat._createTracker('UA-XXXXXXX-X');
  tracker._trackEvent('Users', 'Sign Up');
}
$('.LR-sign-up-submit').click(conversion);
$('.LR-sign-up-input').keypress(function(c) {
	(13 == c.which) && conversion();
});