/**
	* 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
	* $("ul li").hoverIntent({
	*	sensitivity: 2, // number = sensitivity threshold (must be 1 or higher)
	*	interval: 50,   // number = milliseconds of polling interval
	*	over: showNav,  // function = onMouseOver callback (required)
	*	timeout: 100,   // number = milliseconds delay before onMouseOut function call
	*	out: hideNav    // function = onMouseOut callback (required)
	* });
	* 
	* @param  f  onMouseOver function || An object with configuration options
	* @param  g  onMouseOut function  || Nothing (use configuration options object)
	* @return    The object (aka "this") that called hoverIntent, and the event object
	* @author    Brian Cherne <brian@cherne.net>
	*/
	(function($) {
		$.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 );
	
			// instantiate variables
			// cX, cY = current X and Y position of mouse, updated by mousemove event
			// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
			var cX, cY, pX, pY;
	
			// A private function for getting mouse position
			var track = function(ev) {
				cX = ev.pageX;
				cY = ev.pageY;
			};
	
			// A private function for comparing current and previous mouse position
			var compare = function(ev,ob) {
				ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
				// compare mouse positions to see if they've crossed the threshold
				if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
					$(ob).unbind("mousemove",track);
					// set hoverIntent state to true (so mouseOut can be called)
					ob.hoverIntent_s = 1;
					return cfg.over.apply(ob,[ev]);
				} else {
					// set previous coordinates for next time
					pX = cX; pY = cY;
					// use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
					ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
				}
			};
	
			// A private function for delaying the mouseOut function
			var delay = function(ev,ob) {
				ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
				ob.hoverIntent_s = 0;
				return cfg.out.apply(ob,[ev]);
			};
	
			// A private function for handling mouse 'hovering'
			var handleHover = function(e) {
				// next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut
				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; }
	
				// copy objects to be passed into t (required for event object to be passed in IE)
				var ev = jQuery.extend({},e);
				var ob = this;
	
				// cancel hoverIntent timer if it exists
				if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
	
				// else e.type == "onmouseover"
				if (e.type == "mouseover") {
					// set "previous" X and Y position based on initial entry point
					pX = ev.pageX; pY = ev.pageY;
					// update "current" X and Y position based on mousemove
					$(ob).bind("mousemove",track);
					// start polling interval (self-calling timeout) to compare mouse coordinates over time
					if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
	
				// else e.type == "onmouseout"
				} else {
					// unbind expensive mousemove event
					$(ob).unbind("mousemove",track);
					// if hoverIntent state is true, then call the mouseOut function after the specified delay
					if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
				}
			};
	
			// bind the function to the two event listeners
			return this.mouseover(handleHover).mouseout(handleHover);
		};
	})(jQuery);