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 = 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]);    //¹Ù·Î »èÁ¦ ½Ã µ¥ÀÌÅÍ ²¿À̴µí ÇÏ¿© ÀÏ´Ü ÅµÇÔ.
            }else{
                cObjs[i].style.margin = "0";

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

        // ãÀº µ¥ÀÌÅ͸¦ »èÁ¦ÇÔ.(FFÀÇ °æ¿ì text ³ëµå°¡ ÷ºÎµÊ.)
        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;    //ÆÄÆø¿¡¼­ ¸®ÇÁ·¡½Ã ¹®Á¦
    },
    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] );    // Ç×»ó ù¹ø°°ÍÀ» µÚ·Î À̵¿
        }
    },
    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;

                //if¹® ¾È¿¡ ÀÖ´Â°Ô È¿À²
                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 ·Î ±¸ÇÒ ¼ö ÀÖÁö¸¸, MathÇÔ¼ö°¡ ¹«°Å¿î °ü°è·Î À½¼ö ó¸®ÇÔ.(if¹® ¾È¿¡ ÀÖ´Â°Ô È¿À²)
                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;
    }
}


/* »ç¿ë¹ý Start*/
//    var scroll    = new ScrollControl('html element id',options);
//
//    options Ç׸ñ
//    inteval : Àç±ÍÈ£Ã⠽𣠰£°Ý 1/1000ÃÊ(±âº»°ª 50)
//    freeze : Àá½Ã ¸ØÃç ÀÖ´Â ½Ã°£ °£°Ý 1/1000 ÃÊ(±âº»°ª 1000)
//    height : °´Ã¼ ³ôÀÌ(±âº»°ª 20)
//    cMarginTop : ÀÚµ¿À¸·Î ±¸ÇØÁÖ³ª, ±ÛÀÚ Å©±â¿Í °´Ã¼ ³ôÀÌ µîÀ¸·Î ÀÎÇØ, ÀǵµÇÑ ³ôÀÌ°¡ ³ª¿ÀÁö ¾ÊÀ» ¼ö Àֱ⠶§¹®¿¡ »ç¿ëÀÚ°¡ °­Á¦ ÀÔ·ÂÇÔ.
//    line : ½ºÅ©·Ñ line¸¦ ±¸ÇÔ.(ÇØ´ç °´Ã¼ÀÇ ³ôÀÌ´Â line * height)°¡ µÊ.
//    stopline : ±âº»°ª(line¿Í °°À½), stopline Á¤º¸¿¡ µû¶ó line¿Í´Â µ¶¸³ÀûÀ¸·Î ½ºÅ©·ÑÀ» freeze ½ÃÅ´.
//    start : ±âº»°ª 'top', top,down µÎ °ªÀÌ ÀÖÀ½.
//    reverse : [ | all | top | down ]
//            none    - none°¡ ¾Æ´Ñ, °ªÀÌ ¾ø´Ù´Â ¶æÀÓ. ½ÇÁ¦°ª string ''°ª
//            all        - À§, ¾Æ·¡¿¡ ¸ðµÎ reverse¸¦ ½ÃÅ´. ÀÌ ¼³Á¤À» ÇÏ´Â °æ¿ì À§¾Æ·¡·Î ¿Ô´Ù°¬´Ù ÇÔ.
//            top        - course°¡ topÀÎ °æ¿ì, setCourse('down')À» È£ÃâÇÔ
//            down    - course°¡ downÀÎ °æ¿ì, setCourse('top')À» È£ÃâÇÔ
//    style : [ scroll | jump | s-jump | jump-s ]
//            scroll    - ±âº» ½ºÅ©·Ñ ¹× setCourse È£Ã⠽ÿ¡µµ ½ºÅ©·Ñ À̵¿. [±âº»Çü]
//            jump    - ±âº»À¸·Î ´ÙÀ½ Ç׸ñÀ¸·Î Á¡ÇÁ ¹× setCourse È£Ã⠽ÿ¡µµ Á¡ÇÁ À̵¿.
//    
/* »ç¿ë¹ý End */