/* =========================================================
	lesson - tickers
========================================================= */

Element.Methods.show = function(element) {
	$(element).style.display = 'block';
	return element;
};

Element.addMethods();

var myTkrs = new Array();

function initTickers() {
	myTkrs = document.getElementsByClassName('ticker', $('mainBox'));
	myTkrs.each(
		function(myTkr) {
			myTkr.hide();
		}
	);
}

Event.observe(window, 'load', initTickers);

function turnTkrs(targetID) {
	var element = $(targetID);
	if(element.style.display == 'none') {
		myTkrs.each(
			function(myTkr) {
				myTkr.hide();
			}
		);
		element.show();
	} else {
		element.hide();
	}
}