function Ticker(name,id,shiftBy,interval,width){
 this.name=name;
 this.id=id;
 this.shiftBy=shiftBy?shiftBy:1;
 this.interval=interval?interval:100;
 this.runId=null;
 this.div=document.getElementById(id);
 var node=this.div.firstChild;
 var next;
 while(node){
  next=node.nextSibling;
  if(node.nodeType==3)this.div.removeChild(node);
  node=next;
 }
 this.left=0;
 this.shiftLeftAt=this.div.firstChild.offsetWidth;
 this.div.style.height=this.div.firstChild.offsetHeight;
 //this.div.style.width=2*screen.availWidth;
 //this.div.style.width=419;
 this.div.style.width=width;
 this.div.style.visibility='visible';
}


function startTicker(){
 this.stop();
 this.left-=this.shiftBy;
 if(this.left<=-this.shiftLeftAt){
  this.left=0;
  this.div.appendChild(this.div.firstChild);
  this.shiftLeftAt=this.div.firstChild.offsetWidth;
 }
 this.div.style.left=(this.left+'px');
 this.runId=setTimeout(this.name+'.start()',this.interval);
}
function stopTicker(){
 if(this.runId)clearTimeout(this.runId);
 this.runId=null;
}
function changeTickerInterval(newinterval){ 
 if(typeof(newinterval)=='string')
  newinterval=parseInt('0'+newinterval,10);
 if(typeof(newinterval)=='number'&&newinterval>0)
  this.interval=newinterval;
 this.stop();this.start();
}
Ticker.prototype.start=startTicker;
Ticker.prototype.stop=stopTicker;
Ticker.prototype.changeInterval=changeTickerInterval;