/*
无间滚动 2007-8-1
style:滚动方向,左0、右1、上2、下3
*/
function Scroll(id,width,height,speed,style)
{
    var obj=new Array(),para=new Array(),run;
    this.id=id;
    this.w=width;
    this.h=height;
    this.speed=speed;
    this.style=style;
    var sObj=document.getElementById(id);
    var topObj=this;

    this.init=function(){
        var tmp="";
        if (this.style<=1){
            tmp+="<div id=\""+this.id+"_demo\" style=\"overflow:hidden;width:"+this.w+"px;height:"+this.h+"px;text-align:center;\"> ";
            tmp+="  <table cellspacing=\"0\" cellPpadding=\"0\" align=\"center\" border=\"0\" cellspace=\"0\">";
            tmp+="    <tr> ";
            tmp+="       <td id=\""+this.id+"_demo1\" valign=\"top\">"+sObj.innerHTML+"</td>";
            tmp+="       <td id=\""+this.id+"_demo2\" valign=\"top\"></td>";
            tmp+="    </tr>";
            tmp+="  </table>";
            tmp+="</div>";
        }
        else{
            tmp+="<div id=\""+this.id+"_demo\" style=\"overflow:hidden;width:"+this.w+"px;height:"+this.h+"px;text-align:center;\"> ";
            tmp+="   <div id=\""+this.id+"_demo1\">"+sObj.innerHTML+"</div>";
            tmp+="   <div id=\""+this.id+"_demo2\"></div>";
            tmp+="</div>";
        }
        document.writeln(tmp);
        obj[0]=document.getElementById(this.id+"_demo");
        obj[1]=document.getElementById(this.id+"_demo1");
        obj[2]=document.getElementById(this.id+"_demo2");
        obj[2].innerHTML=obj[1].innerHTML;
    }
    this.marquee=function(){
        switch(topObj.style)
        {
            case 0:
                if(obj[0].scrollLeft>=obj[1].scrollWidth) obj[0].scrollLeft=0;
                else obj[0].scrollLeft++;
                break;
            case 1:
                if(obj[0].scrollLeft<=0) obj[0].scrollLeft=obj[1].scrollWidth;
                else obj[0].scrollLeft--;
                break;
            case 2:
                if(obj[0].scrollTop>=obj[1].scrollHeight) obj[0].scrollTop=0;
                else obj[0].scrollTop++;
                break;
            case 3:
                if(obj[0].scrollTop<=0) obj[0].scrollTop=obj[1].scrollHeight;
                else obj[0].scrollTop--;
                break;  
         }
    }
    this.play=function(){
        if (!sObj) return;
        sObj.style.display="none";
        this.init();
        run=setInterval(this.marquee,this.speed);
        obj[0].onmouseover=function(){clearInterval(run);}
        obj[0].onmouseout=function(){run=setInterval(topObj.marquee,topObj.speed);}
    }
}