function Validate_search() {
  
    errfound = false;
    if (!ValidLength(document.search_form.searchtext.value,2) || document.search_form.searchtext.value == 'hledaný výraz') {
        error(document.search_form.searchtext,"Vyplňte dotaz (min. 2 znaky)");
    }
    return !errfound;
}