var rolling_banner = function(ta){
 
 // this.ta.className = 'rolling_banner'; 
  this.ta = ta;
  this.ta_id = 'roll_'+(this.ta.id||this.ta.name);
  this.gap = 5;     //¿òÁ÷ÀÌ´Â Çȼ¿´ÜÀ§
  this.gap_count=0;   //Ä«¿îÆÿë:°ÇµéÁö ¸¶¼¼¿ä
  this.gap_time = '3000';  //¿òÁ÷ÀÌ´Â ´ÜÀ§½Ã°£
  this.gap_sleep = '4000'; //È­¸éÀÌ ¸ØÃçÀÖÀ» ´ÜÀ§½Ã°£
  this.over_stop = true;  //¸¶¿ì½º¸¦ ¿Ã·ÈÀ» ¶§ ¸ØÃâ °ÍÀΰ¡?
  this.timer = null;
  eval(this.ta_id+'=this');
  var temp = eval(this.ta_id);
  this.init_div(); 
 }
 rolling_banner.prototype.start = function(){ //·Ñ¸µ ½ÃÀÛ
  this.ta.readonly =false;
  this.stop =false; 
  if(!this.timer){ 
   this.rolling();  
  }
 }
 rolling_banner.prototype.stop = function(){ //·Ñ¸µ ½ÃÀÛ
  this.stop =true;
 }
 rolling_banner.prototype.init_div = function(){ //<div> »©°í ÀüºÎ Á¦°Å , ½ºÅ¸ÀÏ ÃʱâÈ­
  this.ta.style.position="relative";
  this.ta.style.overflow="hidden";
    this.ta.onmouseover=function(){ 
     eval("this.readOnly=true;"); 
    }
    this.ta.onmouseout=function(){ 
     eval("this.readOnly=false;"); 
    }
 
  var child = this.ta.childNodes;
  var ch = this.ta.firstChild;
  var ch2 = null;
  while(ch){
   ch2 = ch.nextSibling;
    if(ch.nodeName.toLowerCase() !='div'){
     this.ta.removeChild(ch);
    }else{
     ch.style.position = "relative";
     ch.style.borderStyle='none';
     ch.style.top='0px';
    }
   ch=ch2;
  }
 }
 rolling_banner.prototype.strtonum = function(str){
  var num = parseInt(str);
  if(isNaN(num)) num = '0';
  return num
 }
 rolling_banner.prototype.strtopx = function(str){
  var num = this.strtonum(str);
  return num+'px';
 }
 rolling_banner.prototype.rolling = function(){
  if(this.gap_count==0){
   this.sleep();
   this.gap_count+=1;
   return;
  }
  if(!this.ta.readOnly && !this.stop){
   this.rolling_top();
  }
  this.timer = null;
  var re = this.ta_id+'.rolling()';
  this.timer = setTimeout(re,this.gap_time);
 }
 rolling_banner.prototype.rolling_top = function(){
  this.gap_count+=parseInt(this.gap);
  var ch1 = this.ta.firstChild;
  var child = this.ta.childNodes;
  var ta_ch = null;
  var top_ori = this.strtonum(child[0].style.top);
  var top = this.strtopx(top_ori-parseInt(this.gap));   
  
  for(var i=0,m=child.length;i<m;i++){
   child[i].style.top=top;
  }
  
  if(this.gap_count >= this.strtonum(ch1.style.height)){
   var temp =ch1.cloneNode(true); 
   this.ta.removeChild(ch1);
   this.ta.appendChild(temp);
   for(var i=0,m=child.length;i<m;i++){
    child[i].style.top='0px';
   }  
  this.gap_count = 0  
  }
 }
 rolling_banner.prototype.sleep = function(){
  this.timer = null;
  var re = this.ta_id+'.rolling()';
  this.timer = setTimeout(re,this.gap_sleep);
 }