/**
* hoverIntent is similar to jQuery's built-in "hover" function except that
* instead of firing the onMouseOver event immediately, hoverIntent checks
* to see if the user's mouse has slowed down (beneath the sensitivity
* threshold) before firing the onMouseOver event.
* 
* hoverIntent r5 // 2007.03.27 // jQuery 1.1.2+
* <http://cherne.net/brian/resources/jquery.hoverIntent.html>
* 
* hoverIntent is currently available for use in all personal or commercial 
* projects under both MIT and GPL licenses. This means that you can choose 
* the license that best suits your project, and use it accordingly.
* 
* // basic usage (just like .hover) receives onMouseOver and onMouseOut functions
* $("ul li").hoverIntent( showNav , hideNav );
* 
* // advanced usage receives configuration object only
* $("ul li").hoverIntent({
*	sensitivity: 7, // number = sensitivity threshold (must be 1 or higher)
*	interval: 100,   // number = milliseconds of polling interval
*	over: showNav,  // function = onMouseOver callback (required)
*	timeout: 0,   // number = milliseconds delay before onMouseOut function call
*	out: hideNav    // function = onMouseOut callback (required)
* });
* 
* @param  f  onMouseOver function || An object with configuration options
* @param  g  onMouseOut function  || Nothing (use configuration options object)
* @author    Brian Cherne <brian@cherne.net>
*/
(function($) {
	$.fn.hoverIntent = function(f,g) {
		// default configuration options
		var cfg = {
			sensitivity: 7,
			interval: 100,
			timeout: 0
		};
		// override configuration options with user supplied object
		cfg = $.extend(cfg, g ? { over: f, out: g } : f );

		var cX, cY, pX, pY;
		var track = function(ev) {
			cX = ev.pageX;
			cY = ev.pageY;
		};

		var compare = function(ev,ob) {
			ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
			if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
				$(ob).unbind("mousemove",track);
				ob.hoverIntent_s = 1;
				return cfg.over.apply(ob,[ev]);
			} else {
				pX = cX; pY = cY;
				ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
			}
		};
		var delay = function(ev,ob) {
			ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
			ob.hoverIntent_s = 0;
			return cfg.out.apply(ob,[ev]);
		};
		var handleHover = function(e) {
			var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget;
			while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } }
			if ( p == this ) { return false; }

			var ev = jQuery.extend({},e);
			var ob = this;
			if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
			if (e.type == "mouseover") {
				pX = ev.pageX; pY = ev.pageY;
				$(ob).bind("mousemove",track);
				if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}

			} else {
				$(ob).unbind("mousemove",track);
				if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
			}
		};

		return this.mouseover(handleHover).mouseout(handleHover);
	};
})(jQuery);