Response to question on PhantomJS forum: https://groups.google.com/forum/#!topic/phantomjs/DouaSrjwwCE

PixelClicker.js

// Response to question on PhantomJS forum: https://groups.google.com/forum/#!topic/phantomjs/DouaSrjwwCE

function doAlpha(url) {
	var page = require('webpage').create();
	page.open(url, function(status) {
		if (status === 'success') {
			elements = page.evaluate(function() { 			
				// ...
				return result;
			});	
			var coordinates = elements.split(',');

			while (coordinates.length) {
				var coordinate = coordinates.shift().split(':');
				var left = parseInt(coordinate[0], 10);
				var top = parseInt(coordinate[1], 10);

				page.sendEvent('click', left + 1, top + 1);
                        }
                        page.release();
                        phantom.exit();
		}
	});
}