window.onload = function () {

	function toggleMenu(id){
		var elements = document.getElementsByTagName('a');
		var link;
		for (i = 1; i < elements.length; i++) {
			link = document.getElementById(String(id+i));
			if ( link != null ) {
				if ( link.style.display == "none" )
					link.style.display = "";
				else
					link.style.display = "none";
			}
		}
	}

	document.getElementById('aktivnosti').onmousedown = function() { 
		toggleMenu('aktivnosti');
	}


	
};