/*Azek*/
 <script type="text/javascript">
        // AZEK
        if (window.addEventListener) {
            window.addEventListener('message', letsgott, false);
        } else if (window.attachEvent) {
            window.attachEvent('onmessage', letsgott);
        }

        function letsgott(event) {
            var iframe = document.getElementById('my_iframett');
            if (event.origin !== 'https://azek.com') return;
            if (isNaN(event.data)) return;

            var height = parseInt(event.data) + 50;
            iframe.height = height + "px";
        }
</script>

/*Timber Tech*/
<script type="text/javascript">
    // Timbertech
    if (window.addEventListener) {
        window.addEventListener('message', letsgott, false);
    } else if (window.attachEvent) {
        window.attachEvent('onmessage', letsgott);
    }

    function letsgott(event) {
        var iframe = document.getElementById('my_iframett');
        if (event.origin !== 'https://timbertech.com') return;
        if (isNaN(event.data)) return;

        var height = parseInt(event.data) + 50;
        iframe.height = height + "px";
    }
</script>