var newsTicker = {};

// elm, step, speed, delay, actual, timer
newsTicker.ticker = [];
newsTicker.message = [];

newsTicker.init = function(elm, step, speed, delay) {

	if (elm && (elm.tagName == "UL") && document.getElementsByTagName) {
		
		if (isNaN(step)) {var step = 2};
		if (isNaN(speed)) {var speed = 25};
		if (isNaN(delay)) {var delay = 1000};

		newsTicker.message = elm.getElementsByTagName("li");
		for (var i = 0; i < newsTicker.message.length; i++) {
			newsTicker.message[i].style.display = "block";
			newsTicker.message[i].style.left = 0 - newsTicker.message[i].offsetWidth + "px";
		}
		var tickerID = newsTicker.ticker.length;
		newsTicker.ticker[tickerID] = [elm, step, speed, delay, newsTicker.message.length-1];
		elm.newsTickerID = tickerID;
		elm.onmouseover = newsTicker.stop;
		elm.onmouseout = newsTicker.start;
		newsTicker.roll(tickerID);
		return true;
	}
	return false;
}

newsTicker.roll = function(id) {
	if (!isNaN(id) && newsTicker.ticker[id]) {
		
		var ticker = newsTicker.ticker[id];
		var actualMessage = newsTicker.message[ticker[4]];
		var actualMessagePosition = parseInt(actualMessage.style.left);
		if (actualMessagePosition <= 0 - actualMessage.offsetWidth) {
			ticker[4] = (ticker[4]+1 == newsTicker.message.length) ? 0 : ticker[4] + 1;
			actualMessage = newsTicker.message[ticker[4]];
			actualMessagePosition = ticker[0].offsetWidth + (ticker[0].offsetWidth % ticker[1])
			actualMessage.style.left = actualMessagePosition + "px";
		}
		actualMessagePosition = actualMessagePosition- ticker[1];
		actualMessage.style.left = actualMessagePosition + "px";
		ticker[5] = setTimeout("newsTicker.roll(" + id + ")", (actualMessagePosition == 0) ? ticker[3] : ticker[2]);
		return true;
	}
	return false;
}

newsTicker.stop = function(e) {
	id = newsTicker.getId(e);
	if (id) {
		clearTimeout(newsTicker.ticker[id][5]);
		return true;
	}
	return false;
}

newsTicker.start = function(e) {
	id = newsTicker.getId(e);
	if (id) {
		newsTicker.roll(id);
		return true;
	}
	return false;
}

newsTicker.getId = function(e) {
	if (!e && window.event) e = window.event;
	if (!e.target) e.target = e.srcElement;
	var obj = (e.currentTarget) ? e.currentTarget : e.target;
	while (obj!=null && obj.tagName != "ul") {
		obj = obj.parentNode;
		if (obj==null || obj.tagName == "body") {
			return false;
		}
	}
	return obj.newsTickerID;
}