function initMenu() {
	menu = document.getElementById('main-menu');
	years = menu.childNodes;
	for (i=0; i<years.length; i++ )
	{
		if (years[i].className && years[i].className=='rozwin')
		{
			years[i].childNodes[0].onclick=function(){rozwinMenu(this);};
		}
		if (years[i].className && years[i].className=='zwin')
		{
			years[i].childNodes[0].onclick=function(){zwinMenu(this);};
		}
	}


}

function rozwinMenu(node) {
	node.parentNode.className='zwin';
	node.onclick=function(){zwinMenu(this);};
}

function zwinMenu(node) {
	node.parentNode.className='rozwin';
	node.onclick=function(){rozwinMenu(this);};
}



window.onload = function() {initMenu();};