/* ------ scroller ------ */

scrollVertical.prototype.scrollArea = null;
scrollVertical.prototype.scrollMsg = null;
scrollVertical.prototype.unitHeight = 0;
scrollVertical.prototype.msgHeight = 0;
scrollVertical.prototype.copyMsg = null;
scrollVertical.prototype.scrollValue = 0;
scrollVertical.prototype.scrollHeight = 0;
scrollVertical.prototype.isStop = true;
scrollVertical.prototype.isPause = false;
scrollVertical.prototype.scrollTimer = null;
scrollVertical.prototype.speed = 2000;
scrollVertical.prototype.isMoz = function(){
	return navigator.userAgent.toLowerCase().indexOf('gecko') > 0;
};
scrollVertical.prototype.play = function(o){
	var s_msg = o.scrollMsg;
	var c_msg = o.copyMsg;
	var s_area = o.scrollArea;
	var msg_h = o.msgHeight;
	var anim = function(){
		if(o.scrollTimer)
			clearTimeout(o.scrollTimer);
		if(o.isPause){
			o.scrollTimer = setTimeout(anim,10);
			return;
		}
		if(msg_h-o.scrollValue <= 0){
			o.scrollValue = 0;
		}else{
			o.scrollValue += 1;
			o.scrollHeight += 1;
		}
		if(o.isMoz){
			s_area.scrollTop = o.scrollValue;
		}else{
			s_msg.style.top = -1 * o.scrollValue + 'px';
			c_msg.style.top = (msg_h - o.scrollValue) + 'px';
		}
		if(o.scrollHeight % s_area.offsetHeight == 0){
			o.scrollTimer = setTimeout(anim,o.speed);
		}else{
			o.scrollTimer = setTimeout(anim,10);
		}
	}
	;anim();
};
function scrollVertical(disp,msg,tg){
	if(typeof(disp) == 'string'){
		this.scrollArea = document.getElementById(disp);
	}else{
		this.scrollArea = disp;
	}
	if(typeof(msg) == 'string'){
		this.scrollMsg = document.getElementById(msg);
	}else{
		this.scrollMsg = msg;
	}
	var s_msg = this.scrollMsg;
	var s_area = this.scrollArea;
	if(!tg)
		var tg = 'li';
	this.unitHeight = s_msg.getElementsByTagName(tg)[0].offsetHeight;
	this.msgHeight = this.unitHeight*s_msg.getElementsByTagName(tg).length;
	if (s_area.offsetHeight >= this.msgHeight)
		return;
	s_msg.style.position = 'absolute';
	s_msg.style.top = 0;
	s_msg.style.left = 0;
	var copydiv = document.createElement('div');
	copydiv.id = s_area.id + '_copymsgid';
	copydiv.innerHTML = s_msg.innerHTML;
	copydiv.style.height = this.msgHeight + 'px';
	s_area.appendChild(copydiv);
	copydiv.style.position = 'absolute';
	copydiv.style.top = this.msgHeight + 'px';
	copydiv.style.left = 0;
	this.copyMsg = copydiv;
	this.play(this);
}

/* ------ scroller ------ */