function ContentScroller(el, elHeight) {
	this.el = $(el);
	this.scroller = new Fx.Scroll(this.el);
	this.pos = 0;
	this.newpos = 0;
	this.elHeight = elHeight;
};
ContentScroller.prototype.scrollUp = function() {
	this.newpos = this.pos - this.elHeight;
	if (this.newpos < 0) {
		this.pos = 0;
	} else {
		this.pos = this.newpos;
	}
	this.scroller.start(0, this.pos);
	this.newpos = 0;
}
ContentScroller.prototype.scrollDown = function() {
	this.newpos = this.pos + this.elHeight;
	if (this.newpos > this.el.getSize().y) {
		this.pos = this.el.getSize().y;
	} else {
		this.pos = this.newpos;
	}
	this.scroller.start(0, this.pos);
	this.newpos = 0;
}