function hide_extra() {
	document.getElementById("extra").style.display = "none";
	return true;
}
function show_extra() {
	document.getElementById("extra").style.display = "block";
	return true;
}
function change_link() {
	var link = "/search/extra.php?search="+document.getElementById("q_search").value;
	window.location.href = link;
	return true;
}