function scrolling(objId,sec1,sec2,speed,height){ 
	this.objId=objId; 
	this.sec1=sec1; 
	this.sec2=sec2; 
	this.speed=speed; 
	this.height=height; 
	this.h=0; 
	this.div=document.getElementById(this.objId); 
	this.htmltxt=this.div.innerHTML; 
  this.div.innerHTML=this.htmltxt+this.htmltxt; 
  this.div.isover=false; 
  this.div.onmouseover=function(){this.isover=true;} 
  this.div.onmouseout=function(){this.isover=false;} 
  var self=this; 
  this.div.scrollTop=0; 
  window.setTimeout(function(){self.play()},this.sec1); 
} 
scrolling.prototype={ 
	play:function(){ 
		var self=this; 
		if(!this.div.isover){ 
			this.div.scrollTop+=this.speed; 
			if(this.div.scrollTop>this.div.scrollHeight/2){ 
				this.div.scrollTop=0; 
			}else{ 
				this.h+=this.speed; 
				if(this.h>=this.height){ 
					if(this.h>this.height|| this.div.scrollTop%this.height !=0){ 
						this.div.scrollTop-=this.h%this.height; 
					} 
					this.h=0; 
					window.setTimeout(function(){self.play()},this.sec1); 
					return; 
				} 
			} 
		} 
		window.setTimeout(function(){self.play()},this.sec2); 
	}, 
	prev:function(){ 
		if(this.div.scrollTop == 0) 
		this.div.scrollTop = this.div.scrollHeight/2; 
		this.div.scrollTop -= this.height; 
	}, 
	next:function(){ 
		if(this.div.scrollTop ==  this.div.scrollHeight/2) 
		this.div.scrollTop =0; 
		this.div.scrollTop += this.height; 
	} 
};