function changeCaptcha() {
	var n = Math.round(Math.random()*100);
	document.getElementById('captcha').src = '/includes/rnd_image.php?n=' + n;
}

var Showed = new Array();
var Hided = new Array();
var ShowingTime = 250;
var HideingTime = 250;

/*
function showMenu(id) {
	var menu = $('submenu_' + id);
	menu.setStyle('visibility', 'visible');
	menu.getParent('li').setStyle('z-index', '10000');
}

function hideMenu(id) {
	menu = $('submenu_' + id);
	menu.setStyle('visibility', 'hidden');
	menu.getParent('li').setStyle('z-index', '1');
}
*/

function showMenu(id) {
	var menu = $('submenu_' + id);
	if(!menu) return false;
	menu.getPrevious('a').addClass('active');
	if(Hided[id]) $clear(Hided[id]);
	Showed[id] = showMenuTimed.delay(ShowingTime, id);
}

function hideMenu(id) {
	menu = $('submenu_' + id);
	if(!menu) return false;
	menu.getPrevious('a').removeClass('active');
	if(Showed[id]) $clear(Showed[id]);
	Hided[id] = hideMenuTimed.delay(HideingTime, id);
}

function showMenuTimed() {
	var menu = $('submenu_' + this);
	if(!menu) return false;
	menu.setStyle('visibility', 'visible');
	menu.getParent('li').setStyle('z-index', '10000');
}

function hideMenuTimed() {
	menu = $('submenu_' + this);
	if(!menu) return false;       
	menu.setStyle('visibility', 'hidden');
	menu.getParent('li').setStyle('z-index', '1');
}