var newsTicker = {};

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

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};
		
		var message = elm.getElementsByTagName("LI");
		for (var i = 0; i < message.length; i++) {
			message[i].style.left = 0 - message[i].offsetWidth + "px";
		}
		
		var tickerID = newsTicker.ticker.length;
		newsTicker.ticker[tickerID] = new Array(elm, step, speed, delay, message.length-1);
		
		newsTicker.roll(tickerID);
		
		return true;
	}
	return false;
}

newsTicker.roll = function(id) {
	if (!isNaN(id) && newsTicker.ticker[id]) {
		
		var ticker = newsTicker.ticker[id];
		var message = ticker[0].getElementsByTagName("li");
		var actualMessage = message[ticker[4]];

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