var current_menu = 1;

function init ()
{
	switch_menu($('menu' + current_menu));
	var interval = setInterval('step_menu()', 6000);
}

function step_menu ()
{
	var previous_menu = current_menu;
	
	if (current_menu < 4) current_menu++;
	else current_menu = 1;
	
	reset_menu($('menu' + previous_menu));
	switch_menu($('menu' + current_menu));
}

function switch_menu (el)
{
	var element = el.id.substr(4);
	reset_menu($('menu' + current_menu));
	
	current_menu = element;
	$('menu' + element).className = 'hpmenusel';
	$('main').style.backgroundImage='url(_res/menu/' + element + '.jpg)';
}

function reset_menu (element)
{
	element.className = 'hpmenu';
}

function rand (min, max)
{
	var offset = min;
	var range = (max - min) + 1;

	var randomNumber = Math.floor( Math.random() * range) + offset;
	return randomNumber;
}

function $ (object)
{
	if(document.getElementById(object))
	{
		return document.getElementById(object);
	}
	return false;
}