function checkCookie(cookieName) {
            const cookies = document.cookie.split(';');
            for (let i = 0; i < cookies.length; i++) {
                let cookie = cookies[i].trim(); 
                if (cookie.indexOf(cookieName + '=') === 0) {
                return true;
                }
            }
            return false;
        }

        function getCookie(name) {
            const nameEQ = name + '=';
            const ca = document.cookie.split(';'); 
            for (let i = 0; i < ca.length; i++) {
                let c = ca[i];
                while (c.charAt(0) === ' ') { 
                c = c.substring(1, c.length);
                }
                if (c.indexOf(nameEQ) === 0) {
                    return decodeURIComponent(c.substring(nameEQ.length, c.length));
                }
            }
            return null;
        }

        var cookie = '69dfedc98e286';
        if (checkCookie('smdDNI')) {
            cookie = getCookie('smdDNI');
        } else {
            document.cookie = 'smdDNI=69dfedc98e286;path=/; max-age=2592000;';
        }

        document.addEventListener('DOMContentLoaded', function() {
            const queryString = window.location.search;
            const urlParams = new URLSearchParams(queryString);

            // Find the first <a> tag with href starting with tel:
            let replaced_number = '';
            const telLink = document.querySelector('a[href^="tel:"]');
            if (telLink) {
                // Get the phone number from the href, stripping 'tel:' and whitespace
                replaced_number = telLink.getAttribute('href').replace(/^tel:/i, '').replace(/\s+/g, '');
            }
                
            const keyword = urlParams.get('keyword');
            const matchtype = urlParams.get('matchtype');
            const device = urlParams.get('device');
            const network = urlParams.get('network');
            const campaignid = urlParams.get('campaignid');
            const gclid = urlParams.get('gclid');
            const url = window.location.href;

            // Toggle for phone number replacement
            var enableReplacement = false;
            var hasEligibleNumbers = false;
            if(enableReplacement && hasEligibleNumbers && gclid != ''){
                messageElements.forEach(function(element) {
                    element.innerHTML = '<a href="TEL:"></a>';
                });
                document.querySelectorAll('a').forEach(function(link) {
                    const href = link.getAttribute('href');
                    if (href && href.toLowerCase().startsWith('tel:')) {
                        link.setAttribute('href', 'TEL:');
                        link.textContent = '';
                    }
                });
            }

            const postData = {
                keyword: keyword,
                matchtype: matchtype,
                device: device,
                network: network,
                campaignid: campaignid,
                gclid: gclid,
                number: undefined,
                session: cookie,
                replaced_number: replaced_number,
                url: url
            };

            fetch('https://app.smartmarketdental.com/api/dni/save/TEL:', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json; charset=UTF-8'
                },
                body: JSON.stringify(postData)
            })
            .then(response => {
                if (!response.ok) {
                    console.log('error');
                }
                return response.json();
            })
            .then(data => {
                console.log('Success:', data);
            })
            .catch(error => {
                console.log('Error:', error);
            });
        });