function EmptySearch() {
	var cur_val = document.search.search_keywords.value;
	if (cur_val = "enter keywords...") document.search.search_keywords.value = "";
}


function validForm(f) {
    var tmp = f.search_keywords.value;
    if(!tmp || (tmp == "enter keywords...") || (tmp.length <= 3)) alert("Wrong keywords were entered");
    else f.submit(); // Отправляем на сервер
}