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Editing: scrollspy.js

var ScrollSpy = new Class({

/* implements ver. 1.2.1 */
	Implements: [Options,Events],

/* options */
	options: {
		container: window,
		max: 0,
		min: 0,
		mode: 'vertical'/*,
		onEnter: $empty,
		onLeave: $empty,
		onScroll: $empty,
		onTick: $empty
		*/
	},

/* initialization */
	initialize: function(options) {
		/* set options */
		this.setOptions(options);
		this.container = document.id(this.options.container);
		this.enters = this.leaves = 0;
		this.max = this.options.max;
		this.inside = false;
		
		/* make it happen */
		this.addListener();
	},

/* a method that does whatever you want */
	addListener: function() {
		/* state trackers */
		this.container.addEvent('scroll',function(e) {
			/* if it has reached the level */
			var position = this.container.getScroll(),
				xy = position[this.options.mode == 'vertical' ? 'y' : 'x'];
			/* if we reach the minimum and are still below the max... */
			if(xy >= this.options.min && (this.max == 0 || xy <= this.max)) {
					/* trigger Enter event if necessary */
					if(!this.inside) {
						/* record as inside */
						this.inside = true;
						this.enters++;
						/* fire enter event */
						this.fireEvent('enter',[position,this.enters,e]);
					}
					/* trigger the "tick", always */
					this.fireEvent('tick',[position,this.inside,this.enters,this.leaves,e]);
			}
			/* trigger leave */
			else if(this.inside){
				this.inside = false;
				this.leaves++;
				this.fireEvent('leave',[position,this.leaves,e]);
			}
			/* fire scroll event */
			this.fireEvent('scroll',[position,this.inside,this.enters,this.leaves,e]);
		}.bind(this));
	}
});

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