<script type="text/javascript">
function setCookie(name, value, days){
    var date = new Date();
    date.setTime(date.getTime() + (days*24*60*60*1000)); 
    var expires = "; expires=" + date.toGMTString();
    document.cookie = name + "=" + value + expires + ";path=/";
}
function getParam(p){
    var match = RegExp('[?&]' + p + '=([^&]*)').exec(window.location.search);
    return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
}
var yclid = getParam('yclid');
if(yclid){
    setCookie('yclid', yclid, 90);
}
</script> 

<script> 
function readCookie(name) { 
    var n = name + "="; 
    var cookie = document.cookie.split(';'); 
    for (var i = 0; i < cookie.length; i++) {      
        var c = cookie[i];      
        while (c.charAt(0) == ' ') {
            c = c.substring(1, c.length);
        }      
        if (c.indexOf(n) == 0) {
            return c.substring(n.length, c.length);
        } 
    } 
    return null; 
} 

function setYclidValues() {
    var inputFields = document.querySelectorAll('.yclid_field input');
    var yclidValue = readCookie('yclid');

    for (var i = 0; i < inputFields.length; i++) {
        if (!inputFields[i].value) {
            inputFields[i].value = yclidValue;
        }
    }
}

window.onload = function() {      
    setYclidValues(); // Подстановка значений при загрузке страницы

    // Подстановка значений после каждого скролла
    window.addEventListener('scroll', setYclidValues);
}
</script>