var speed=20; 
var direction = 'left'; 
document.getElementById('demo2').innerHTML=document.getElementById('demo1').innerHTML 
document.getElementById('demo').scrollLeft = document.getElementById('demo1').offsetWidth; 
function setdirection (d) 
{ 
    direction = d; 
} 
function Marquee(){ 
    if(direction=='left'){ 
        if(document.getElementById('demo2').offsetWidth-document.getElementById('demo').scrollLeft<=0) 
            document.getElementById('demo').scrollLeft -= document.getElementById('demo1').offsetWidth; 
        else{ 
            document.getElementById('demo').scrollLeft++ 
        } 
    }else{ 
        if(document.getElementById('demo2').offsetWidth-document.getElementById('demo').scrollLeft>=document.getElementById('demo1').offsetWidth){ 
            document.getElementById('demo').scrollLeft += document.getElementById('demo1').offsetWidth; 
        }else{ 
            document.getElementById('demo').scrollLeft--; 
        } 
    } 
} 
var MyMar=setInterval(Marquee,speed) 
document.getElementById('demo').onmouseover=function() {clearInterval(MyMar)} 
document.getElementById('demo').onmouseout=function() {MyMar=setInterval(Marquee,speed)} 
function changepic (updown) 
{ 
	var current = 0; 
    if(updown=="up"){ 
        if(current>0) 
            current--; 
    }else if(updown=="down"){ 
        if(current<bm.length-1) 
            current++; 
    }else{ 
        current = arguments[1]; 
    } 
    document.getElementById('bmodel').src = bm[current]; 
}