/*************************************************\

    功能       : 垂直跑馬燈

    版本       : 1.2

    適用瀏覽器 : >= IE 5, >= NS 6

    出產日期   : 2004/03/09

    作者       : gaga

    電郵1      : charles@ttnet.net

    電郵2      : charlemagnechen@pchome.com.tw



參考 roll1.htm , roll2.htm

new Roller(物件名, 高度, 滾動速度(毫秒), 停格時間(毫秒), 內容個數)

\*************************************************/

function Roller(nme, cHeight, rollspeed, waittime, total){

    this.nme = nme;

    this.cHeight = cHeight;

    this.rollspeed = rollspeed;

    this.waittime = waittime;

    this.total = total;

    this.pause_yn = 1;

    this.whichNext = "";

    

    this.start = start;

    this.rollgo = rollgo;

    this.rollpause = rollpause;

    

    function start(){

    	if (document.layers) {

    		document[this.nme+"a"].document.open();

    		document[this.nme+"a"].document.write("Suggest you upgrade to Netscape 7.1");

            document[this.nme+"a"].document.close();

        }else{

            //this.rollgo(1, this.cHeight);
            this.rollgo(1, 1);

        }

    }



    function rollgo(which,pos){

        if (this.pause_yn == 0){

            setTimeout(this.nme+".rollgo("+which+","+pos+")", 100);

            return;

        }

        if (which == this.total){

            this.whichNext = 1;    

        }else{

            this.whichNext = which*1+1;

        }



        pos -= 1;

        document.getElementById(this.nme+""+which).style.top = pos;

        document.getElementById(this.nme+""+this.whichNext).style.top = pos*1 + this.cHeight*1;



        if (pos == this.cHeight*-1){

            document.getElementById(this.nme+""+which).style.top = this.cHeight;

            which++;

            if (which > this.total) {

                which = 1;

            } 

            this.rollgo(which,1);

            return;

        }

        else if (pos == 0){

            setTimeout(this.nme+".rollgo("+which+",0)", this.waittime);

            return;    

        }

        else if (pos > this.cHeight*-1){

            setTimeout(this.nme+".rollgo("+which+","+pos+")", this.rollspeed);

            return;

        }

    }



    function rollpause(pause_ornot){

        this.pause_yn = pause_ornot; 

    }

}