Split testing (or A/B testing) with Clicky

Quick script for tracking split tests (or A/B tests) using Clicky analytics. This must go before Clicky is loaded.

// set the colours available
var colours = Array('red', 'yellow', 'blue');
// choose one at random
var colour = colours[Math.floor(Math.random()*colours.length)];
// create the var
var clicky_custom = {};
// test for a cookie setting the colour already
if ( !$.cookie('buttoncolour') ) {
	// no cookie so set one
	$.cookie("buttoncolour", colour, { expires : 7 });
	// add the relevant class to the button
      	$('input#purchase').addClass(colour);
	// tell clicky what to record
      	clicky_custom.split = {
        	name: 'Button colour',
        	version: colour
      	};
} else {
	// cookie is set so get the value and use it
      	$('input#purchase').addClass($.cookie('buttoncolour'));
      	clicky_custom.split = {
        	name: 'Button colour',
        	version: $.cookie('buttoncolour')
      	};
}