var rolling_banner = function(ta){
 this.ta = ta;
// this.ta.className = 'rolling_banner'; 
 this.ta_id = 'roll_'+(this.ta.id||this.ta.name);
 this.gap = 5;     //움직이는 픽셀단위
 this.gap_count=0;   //카운팅용:건들지 마세요
 this.gap_time = '1000';  //움직이는 단위시간
 this.gap_sleep = '2000'; //화면이 멈춰있을 단위시간
 this.over_stop = true;  //마우스를 올렸을 때 멈출 것인가?
 this.timer = null;
 eval(this.ta_id+'=this');
 var temp = eval(this.ta_id);
 this.init_div(); 
}
rolling_banner.prototype.start = function(){ //롤링 시작
 this.ta.readonly =false;
 this.stop =false; 
 if(!this.timer){ this.rolling();  }
}
rolling_banner.prototype.stop = function(){ //롤링 시작
 this.stop =true;
}
rolling_banner.prototype.init_div = function(){ //<div> 빼고 전부 제거 , 스타일 초기화
 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);
}