Google revised PPC code

script.js

window.onload = function() {      
	// document.getElementById('gclid_field').value = 'working'; 
	var fields = document.querySelectorAll('.gclid_field');
	for ( var i = 0; i < fields.length; i++ ) {
	  fields[i].value = readCookie('gclid');
	}			
}