Smart Hover Box for Mootools 1.2 v1

<a id="hover_control" href="#">Hover Here</a>
 
<div id="hover_control_smarthbox">This element is now a hoverbox.</div>

window.addEvent('domready', function() {
  var smartBox = new SmartHoverBox({ //initiate your new class here
    xOffset: 2 //set your options in here
    lockX: 'left' //set your options in here
  });
});

/* Smart Hover Box for Mootools 1.2
 * v1.0
 * Dedicated to public domain
 * troy@consideropen.com
 * www.consideropen.com/blog
*/
 
/* Usage:
 * to implement smart hover box,
 * take the id of the element you want to hover over,
 * then use the id +  the "smartBoxSuffix" as the id for the hover element.
 * Finally, create a new SmartHoverBox class and set any options you want to change.
*/
 
var SmartHoverBox = new Class({
	Implements: Options,
	options: {
		boxTimer           : 1000, // how many milliseconds before the box hides after mouseleave
                yOffset             : -10, // up and down offset in px - accepts negative ints
                xOffset             : -10, // left and right offset in px - accepts negative ints
		smartBoxSuffix    : '_smarthbox', //suffix that creates a hover box
		smartBoxClose    : 'smarthbox_close', //this class will add "close" click event to element
		lockY   	       : '', // 'top', 'bottom'
		lockX    	       : '' // 'left', 'right'
	},
	initialize: function(options) {
		this.setOptions(options);
		this.pos = [];
		this.smartBoxes = $$('[id$=' + this.options.smartBoxSuffix + ']');
		this.closeElem = $(document.body).getElements('.' + this.options.smartBoxClose);
		this.closeElem.addEvent('click', function(e){
			e.preventDefault();
			this.closeBox();
		}.bind(this)).setStyle('cursor', 'pointer');
		this.smartBoxes.setStyle('display', 'none');
		this.showHideBox();
		this.closeBox();
	},
	showHideBox: function(){
		this.smartBoxes.each(function(item){
			this.getCurrentBox(item);
 
			item.addEvent('mouseleave', function(){this.closeBoxTimer()}.bind(this));
			item.addEvent('mouseenter', function(){$clear(this.delay)}.bind(this));
			$(this.currentBox).addEvent('mouseleave', function(){this.closeBoxTimer()}.bind(this));
			$(this.currentBox).addEvent('mouseenter', function(){
				this.getCurrentBox(item);
				$clear(this.delay);
				this.smartBoxes.setStyle('display', 'none');
				item.setStyles({ display: 'block', position: 'absolute' }).setStyle('z-index', '1000000');
 
				this.positioning(item, this.currentBox);
 
			}.bind(this)).setStyle('cursor', 'pointer');
		}.bind(this));
	},
	closeBoxTimer: function(){
		this.hideEm = function(){this.closeBox()}.bind(this);
		this.delay = this.hideEm.delay(this.options.boxTimer);
	},
	closeBox: function() {
		this.smartBoxes.setStyle('display', 'none');
	},
	positioning: function(currentItem, currentLink){
		this.pos.windowSize = $(window).getSize();
		this.pos.windowScroll = $(window).getScroll();
		this.pos.boxSize = currentItem.getSize();
		this.pos.inputPOS = $(currentLink).getCoordinates();
		this.pos.inputCOOR = $(currentLink).getPosition();
		this.pos.inputSize = $(currentLink).getSize();
		this.pos.halfWindowY = this.pos.windowSize.y / 2;
		this.pos.halfWindowX = this.pos.windowSize.x / 2;
		this.pos.inputBottomPOS = this.pos.inputPOS.top + this.pos.inputSize.y;
		this.pos.inputBottomPOSAdjust = this.pos.inputBottomPOS - this.pos.windowScroll.y
		this.pos.inputLeftPOS = this.pos.inputPOS.left + this.options.xOffset;
		this.pos.inputRightPOS = this.pos.inputPOS.right;
		this.pos.leftOffset = this.pos.inputCOOR.x + this.options.xOffset;
 
		if(this.pos.halfWindowY < this.pos.inputBottomPOSAdjust && this.options.lockY == 'none' || this.options.lockY == 'top') {
			currentItem.setStyle('top', this.pos.inputPOS.top - this.pos.boxSize.y - this.options.yOffset); //top
			if (this.pos.inputLeftPOS < this.pos.halfWindowX && this.options.lockX == 'none' || this.options.lockX == 'left' ) {
				currentItem.setStyle('left', this.pos.leftOffset); //top left
			}
			else { currentItem.setStyle('left', (this.pos.inputPOS.right - this.pos.boxSize.x) - this.options.xOffset); }; //top right
		}
		else {
			currentItem.setStyle('top', this.pos.inputBottomPOS + this.options.yOffset); //bottom
			if (this.pos.inputLeftPOS < this.pos.halfWindowX && this.options.lockX == 'none' || this.options.lockX == 'left' ) {
				currentItem.setStyle('left', this.pos.leftOffset); //bottom left
			}
			else { currentItem.setStyle('left', (this.pos.inputPOS.right - this.pos.boxSize.x) - this.options.xOffset);};//bottom right
		};
	},
	getCurrentBox: function(currentItem){
		this.currentBox = currentItem.getProperty('id');
		this.currentBox = this.currentBox.replace('' + this.options.smartBoxSuffix + '', '');
	}
});

//this will close any open hoverbox initiated by the smartBox class instance.
smartBox.closeBox();

<span id="instructions">instructions</span>
 
<div id="instructions_smarthbox">
 
<ul>
 
	<li>Step one</li>
 
 
	<li>Step two</li>
 
 
	<li>Step three</li>
 
</ul>
</div>