function validate_page_select(page_name, page_value, extra_perimeter) {
    var i = page_value.indexOf(",");
    var len = page_value.length;
    var start = page_value.substr(0, i);
    i = i * 1;
    i++;
    var ofset = page_value.substr(i, len);

    var next_page = page_name + "?start=" + start + "&ofset=" + ofset + extra_perimeter;
    window.location.href = next_page;
    return true;
}