function getElementsByClass(searchClass,node,tag) {
	
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag.toLowerCase());
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function scrollbar (_content, _up, _down) {
	_content.step = 1;
	_content.time = 10;

	_up.content = _down.content = _content;
	
	_content.goUp = function (o) {
		var former = window.scrollTarget.scrollTop;
		window.scrollTarget.scrollTop -= window.scrollTarget.step;
		if(window.scrollTarget.scrollTop == former) {
			window.scrollTarget.stop();
		}
		return true;
	};
	
	_content.startUp = function (e) {
		window.scrollTarget = this.content;
		this.content.interval = window.setInterval(this.content.goUp, this.content.time);
		return true;
	};
	
	
	_content.goDown = function () {
		var former = window.scrollTarget.scrollTop;
		window.scrollTarget.scrollTop += window.scrollTarget.step;
		if(window.scrollTarget.scrollTop == former) {
			window.scrollTarget.stop();
		}
		return true;
	};
	
	_content.startDown = function (e) {
		this.content.stop();
		window.scrollTarget = this.content;
		window.scrollTarget.stop();
		this.content.interval = window.setInterval(this.content.goDown, this.content.time);
		return true;
	};
	
	_content.stop = function (e) {
		if(window.scrollTarget && window.scrollTarget.interval) {
			window.clearInterval(window.scrollTarget.interval);
			window.scrollTarget.interval = false;
		}
		return true;
	};
		
	_up.onmousedown = _content.startUp;
	_down.onmousedown = _content.startDown;
	_up.onmouseout = _down.onmouseout = _up.onmouseup = _down.onmouseup = _content.stop;
	_content.scrollTop = 0;
}

function scrollbarInit() {
	var news = document.getElementById('newsBox');
	scrollbar(news.firstChild, getElementsByClass('up', news, 'div')[0], getElementsByClass('down', news, 'div')[0]);
	
	var content = document.getElementById('content');
	if(content) {
		scrollbar(content.firstChild, getElementsByClass('up', content, 'div')[0], getElementsByClass('down', content, 'div')[0]);
	}
}