Changes

<script> var addUrlParamsToIframeSrcs = function() { const validParameters = ["checkin", "checkout", "numnight", "numadult", "numchild", "ownerid", "propid", "roomid", "referer", "redirect", "lang", "group", "nogroup", "category1", "category2", "category3", "category4", "customParameter"]; const currentUrl = new URL(window.location.href); let parametersString = ""; validParameters.forEach(parameter => { const parameterValue = currentUrl.searchParams.get(parameter); if (parameterValue !== null) { parametersString += "&" + parameter + "=" + parameterValue; } }); const iframes = document.getElementsByTagName("iframe"); for (let iframe of iframes) { let iframeSrc = iframe.getAttribute("data-src"); if (iframeSrc === null) { continue; } if (!iframeSrc.includes("?")) { iframeSrc += "?"; } iframeSrc += parametersString; iframe.setAttribute("src", iframeSrc) } }; addUrlParamsToIframeSrcs();</script>