function change(element, maxelements) {
	for (i=1; i <= maxelements; i++) {
		var id = 'l_' + i;
		if (element != id) {
			var ids = id + 's';
			document.getElementById(id).className = '';
			document.getElementById(ids).style.display = 'none';
		}
	}
	var elements = element + 's';
	document.getElementById(element).className = 'active';
	document.getElementById(elements).style.display = 'block';
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

function switcher() {
	var topcontent = document.getElementById('top').innerHTML;
	document.getElementById('top').innerHTML = document.getElementById('bottom').innerHTML;
	document.getElementById('bottom').innerHTML = topcontent;
	if (readCookie('paroswitcher') != null) {
		eraseCookie('paroswitcher');
	} else createCookie('paroswitcher', 'switched', 1);
}