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)} 
	
	var current = 0; 
	function changepic (updown) 
	{ 
		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];
	}