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.display = "block";
      message[i].style.left = 0 - message[i].offsetWidth + "px";
    }
    
    var tickerID = newsTicker.ticker.length;
    newsTicker.ticker[tickerID] = [elm, step, speed, delay, 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 message = ticker[0].getElementsByTagName("li");
    var actualMessage = message[ticker[4]];

    if (actualMessage.offsetLeft <= 0 - actualMessage.offsetWidth) {
      ticker[4] = (ticker[4]+1 == message.length) ? 0 : ticker[4] + 1;
      actualMessage = message[ticker[4]];
      actualMessage.style.left = ticker[0].offsetWidth + (ticker[0].offsetWidth % ticker[1]) + "px";
    }
    
    actualMessage.style.left = parseInt(actualMessage.offsetLeft) - ticker[1] + "px";

    
    ticker[5] = setTimeout("newsTicker.roll(" + id + ")", (parseInt(actualMessage.style.left) == 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.tagName != "UL") {
    obj = obj.parentNode;
    if (obj.tagName == "BODY") {
      return false;
    }
  }
  return obj.newsTickerID;
}