Ticker de cinta

<SCRIPT>
var leftPos      = 187;
var topPos      = 162.5; 
var tickerWidth    = 200; 
var tickerSpeed    =  20; 
var tickerMoveBy   = -1.2;

var isIE = document.all ? true : false;
var tickerEntireWidth = 0;
var first = true;
var tickerWindowRightPos = leftPos + tickerWidth;
var tickerCurrentRightPos = tickerWindowRightPos - leftPos;
var tickerCurrentLeftPos = tickerWindowRightPos;
var tickerTimer;

function tickinit(_objId)
{
 if (isIE)
 {
  var tickerObj = document.all[_objId];
    var temp=tickerObj.style.width.toString();
    tickerEntireWidth=parseInt(temp.substr(0,temp.length-2));
  if (leftPos == 0 && topPos == 0)
    {
   leftPos = getLeft(tickerObj);
   topPos = getTop(tickerObj);
  }
  tickerObj.style.posTop = topPos;
 }
 tickerWindowRightPos = leftPos + tickerWidth;
 tickerCurrentRightPos = tickerWindowRightPos - leftPos;
 tickerCurrentLeftPos = tickerWindowRightPos;
 tickKill(_objId);
 tickerTimer=eval("setInterval('tick(\""+_objId+"\")', tickerSpeed);");
}

function tickKill(_objId)
{
 if(tickerTimer)
 {
  clearInterval(tickerTimer);
  tickerTimer=null;
 }
}

function getLeft(_obj)
{
 if (_obj.offsetParent)
  return (_obj.offsetLeft + getLeft(_obj.offsetParent));
 else
  return (_obj.offsetLeft);
}

function getTop(_obj)
{
 if (_obj.offsetParent)
  return (_obj.offsetTop + getTop(_obj.offsetParent));
 else
  return (_obj.offsetTop);
}

function tick(_objId)
{
 tickerCurrentLeftPos += tickerMoveBy;
 if (tickerCurrentLeftPos + tickerEntireWidth < tickerCurrentRightPos)
  tickerCurrentLeftPos = tickerWindowRightPos;
 cl = leftPos - tickerCurrentLeftPos;
 cr = tickerWindowRightPos - tickerCurrentLeftPos;
 if (isIE)
 {
  var _obj = document.all[_objId];
  _obj.style.posLeft = tickerCurrentLeftPos;
  _obj.style.posTop = topPos;
  _obj.style.clip = "rect(auto "+cr+"px auto "+cl+"px)";
  if (first)
     _obj.style.visibility = "visible";
 }
 first = false;
}

</SCRIPT>