function MarqueeLeft(){ 
	if(demo2.offsetWidth-demo.scrollLeft<=0) 
		demo.scrollLeft-=demo1.offsetWidth 
	else{ 
		demo.scrollLeft++ 
	} 
}
function MarqueeRight(){ 
	if(demo.scrollLeft<=0) 
		demo.scrollLeft+=demo1.offsetWidth 
	else{ 
		demo.scrollLeft--
	} 
}