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// Function to get URL parameters function getUrlParameter(name) { name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]'); let regex = new RegExp('[\\?&]' + name + '=([^&#]*)'); let results = regex.exec(location.search); return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' ')); } // Wait for the page to fully load $w.onReady(function () { // Capture the gclid parameter and assign it to the hidden field $w('#gclid').value = getUrlParameter('gclid'); });