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jQuery.fn.utm_tracking = function(domain, source, medium, campaign) {
  $(this).find('a[href^="' + domain + '"]').each(function() {
		var url = $(this).attr('href');
		$(this).attr( 'href', url + '?utm_source=' + source + '&utm_medium=' + medium + '&utm_campaign=' + campaign );
	});
}

// Example Call
$(document).ready( function() {
     $('body').utm_tracking('http://www.example.com','example_source','example_link','example_campaign');
});