Replace param in url

function replaceQueryParam(param, newval, search) {
        var regex = new RegExp("([?;&])" + param + "[^&;]*[;&]?");
        var query = search.replace(regex, "$1").replace(/&$/, '');

        return (query.length > 2 ? query + "&" : "?") + (newval ? param + "=" + newval : '');
    }
    
    
    var str = window.location.search;
            str = replaceQueryParam('lat', gValue.latitude, str);
            str = replaceQueryParam('lng', gValue.longitude, str);
            window.location = window.location.pathname + str;