var ScrollControl = function(objId,options){ 
this.init(objId,options); 
} 
ScrollControl.prototype = { 
stage : {}, 
options : {}, 
isover : false, 
freeze : false, 
course : 'top', 
itimes : 0, 
top : 0, 

init : function(objId,options){ 
this.setOptions(options); 
this.setStage(objId); 
this.setTrueData(); 

this.move(); 
}, 
setOptions : function(options){ 
options.inteval = options.inteval || 50; 
options.freeze = options.freeze || 1000; 
options.height = parseInt(options.height, 10) || 20; 
options.style = options.style || 'scroll'; 
options.line = options.line || 1; 
options.stopline = options.stopline || options.line; 
options.reverse = options.reverse || ''; 
options.debug = options.debug || false; 

options.blockHeight = options.height * options.line; 
options.stopHeight = options.height * (options.stopline || options.line); 


// options.cMarginTop = options.cMarginTop || (options.height/2) * 0.3; 
options.cMarginTop = 0; 
options.cHeight = options.height - options.cMarginTop; 
options.freeze = (options.style == 'no-freeze') ? options.inteval : options.freeze;
 
switch(options.style){ 
case 'jump' : options.style = options.style; break; 
default : options.style = 'scroll'; break; 
} 


this.course = options.start || 'top'; 
this.options = options; 
}, 
setTrueData : function(){ 
var cObjs = this.stage.childNodes; 
var cObjLen = cObjs.length; 
var removes = []; 

for(var i=0;i<cObjs.length;i++){ 
if(!cObjs[i].tagName){ 
removes.push(cObjs[i]); //바로 삭제 시 데이터 꼬이는듯 하여 일단 킵함. 
}else{ 
cObjs[i].style.margin = "0"; 

cObjs[i].style.marginTop = this.options.cMarginTop; 
cObjs[i].style.height = this.options.cHeight+'px'; 
} 
} 

// 찾은 데이터를 삭제함.(FF의 경우 text 노드가 첨부됨.) 
for(var i=0;i<removes.length;i++){ 
this.stage.removeChild(removes[i]); 
} 

if(!this.options.debug && cObjLen <= this.options.line ){ 
var attachLen = parseInt(this.options.line/cObjLen, 10); 

for(var i=0; i<attachLen; i++){ 
for(var j=0; j<cObjLen; j++){ 
this.stage.appendChild( cObjs[j].cloneNode(true) ); 
} 
} 
} 

}, 
setStage : function(objId){ 
var This = this; 
this.stage = document.getElementById(objId); 

this.stage.style.height = this.options.blockHeight+'px'; 
this.stage.style.padding = "0px"; 
this.stage.style.margin = "0px"; 

if(!this.options.debug) 
this.stage.style.overflow = "hidden"; 


this.stage.onmouseover = function(){This.isover=true;} 
this.stage.onmouseout = function(){This.isover=false;} 

this.stage.scrollTop = 0; //파폭에서 리프래시 문제 
}, 
setCourse : function(course){ 
if(this.course != 'down' && course == 'down' && this.stage.scrollTop <= 0){ 
this.changeChild(); 
this.stage.scrollTop = this.options.height; 
}else if(course == 'top' && this.stage.scrollTop >= this.options.height){ 
if(this.options.reverse != 'all'){ 
this.changeChild(this.options.line); 
this.stage.scrollTop = this.stage.scrollTop - this.options.stopHeight; 
} 
} 

this.course = course; 
if(this.itimes > 0){ 
window.clearTimeout(this.itimes); 
this.move(); 
} 
}, 
changeChild : function(count){ 
if(count == undefined){ count = this.stage.childNodes.length - 1;} 

for(var i=0; i<count;i++ ){ 
this.stage.appendChild( this.stage.childNodes[0] ); // 항상 첫번째것을 뒤로 이동 
} 
}, 
actionTop : function(){ 
if(this.options.style == 'jump'){ 
this.changeChild(this.options.stopline); 
this.stage.scrollTop = 0; 
this.freeze = true; 
}else{ 
this.top++; 
this.stage.scrollTop++; 

if( this.stage.scrollTop >= this.options.height ){ 
this.changeChild(1); 
this.stage.scrollTop = this.stage.scrollTop - this.options.height; 

//if문 안에 있는게 효율 
if( this.top >= this.options.stopHeight ){ 
this.top = 0; 
this.freeze = true; 
if(this.options.reverse == 'top' || this.options.reverse == 'all') this.setCourse("down");
 } 
} 
} 
}, 
actionDown : function(){ 
if(this.options.style == 'jump'){ 
this.freeze = true; 
for(var i=0; i<this.options.stopline;i++){ 
this.changeChild(); 
} 
}else{ 
this.top--; 
this.stage.scrollTop--; 

if( this.stage.scrollTop <= 0 ){ 
this.changeChild(); 
this.stage.scrollTop = this.stage.scrollTop + this.options.height; 

//Math.abs 로 구할 수 있지만, Math함수가 무거운 관계로 음수 처리함.(if문 안에 있는게 효율) 
if( -(this.top) >= this.options.stopHeight ){ 
for(var i=1; i<this.options.stopline;i++){ 
this.changeChild(); 
} 

this.top = this.top + this.options.stopHeight; 
this.freeze = true; 
} 
} 
} 

if(this.freeze){ 
this.stage.scrollTop = this.options.stopHeight; 
if(this.options.reverse == 'down' || this.options.reverse == 'all') this.setCourse("top");
 } 

}, 
move : function(){ 
this.itimes = 0; 
if(!this.isover){ 
if(this.course == 'top') this.actionTop(); 
else this.actionDown(); 
} 

var This = this; 
if(this.freeze){ this.itimes = window.setTimeout(function(){This.move()}, this.options.freeze); }
 else{ window.setTimeout(function(){This.move()}, this.options.inteval); } 
this.freeze = false; 
} 

}