/**
* jQuery.ScrollTo
* Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Dual licensed under MIT and GPL.
* Date: 5/25/2009
*
* @projectDescription Easy element scrolling using jQuery.
* http://flesler.blogspot.com/2007/10/jqueryscrollto.html
* Works with jQuery +1.2.6. Tested on FF 2/3, IE 6/7/8, Opera 9.5/6, Safari 3, Chrome 1 on WinXP.
*
* @author Ariel Flesler
* @version 1.4.2
*
* @id jQuery.scrollTo
* @id jQuery.fn.scrollTo
* @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements.
*	  The different options for target are:
*		- A number position (will be applied to all axes).
*		- A string position ('44', '100px', '+=90', etc ) will be applied to all axes
*		- A jQuery/DOM element ( logically, child of the element to scroll )
*		- A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
*		- A hash { top:x, left:y }, x and y can be any kind of number/string like above.
*		- A percentage of the container's dimension/s, for example: 50% to go to the middle.
*		- The string 'max' for go-to-end. 
* @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead.
* @param {Object,Function} settings Optional set of settings or the onAfter callback.
*	 @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
*	 @option {Number} duration The OVERALL length of the animation.
*	 @option {String} easing The easing method for the animation.
*	 @option {Boolean} margin If true, the margin of the target element will be deducted from the final position.
*	 @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }.
*	 @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
*	 @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends.
*	 @option {Function} onAfter Function to be called after the scrolling ends. 
*	 @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends.
* @return {jQuery} Returns the same jQuery object, for chaining.
*
* @desc Scroll to a fixed position
* @example $('div').scrollTo( 340 );
*
* @desc Scroll relatively to the actual position
* @example $('div').scrollTo( '+=340px', { axis:'y' } );
*
* @dec Scroll using a selector (relative to the scrolled element)
* @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
*
* @ Scroll to a DOM element (same for jQuery object)
* @example var second_child = document.getElementById('container').firstChild.nextSibling;
*			$('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){
*				alert('scrolled!!');																   
*			}});
*
* @desc Scroll on both axes, to different values
* @example $('div').scrollTo( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } );
*/
; (function($) {

	var $scrollTo = $.scrollTo = function(target, duration, settings) {
		$(window).scrollTo(target, duration, settings);
	};

	$scrollTo.defaults = {
		axis: 'xy',
		duration: parseFloat($.fn.jquery) >= 1.3 ? 0 : 1
	};

	// Returns the element that needs to be animated to scroll the window.
	// Kept for backwards compatibility (specially for localScroll & serialScroll)
	$scrollTo.window = function(scope) {
		return $(window)._scrollable();
	};

	// Hack, hack, hack :)
	// Returns the real elements to scroll (supports window/iframes, documents and regular nodes)
	$.fn._scrollable = function() {
		return this.map(function() {
			var elem = this,
				isWin = !elem.nodeName || $.inArray(elem.nodeName.toLowerCase(), ['iframe', '#document', 'html', 'body']) != -1;

			if (!isWin)
				return elem;

			var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem;

			return $.browser.safari || doc.compatMode == 'BackCompat' ?
				doc.body :
				doc.documentElement;
		});
	};

	$.fn.scrollTo = function(target, duration, settings) {
		if (typeof duration == 'object') {
			settings = duration;
			duration = 0;
		}
		if (typeof settings == 'function')
			settings = { onAfter: settings };

		if (target == 'max')
			target = 9e9;

		settings = $.extend({}, $scrollTo.defaults, settings);
		// Speed is still recognized for backwards compatibility
		duration = duration || settings.speed || settings.duration;
		// Make sure the settings are given right
		settings.queue = settings.queue && settings.axis.length > 1;

		if (settings.queue)
		// Let's keep the overall duration
			duration /= 2;
		settings.offset = both(settings.offset);
		settings.over = both(settings.over);

		return this._scrollable().each(function() {
			var elem = this,
				$elem = $(elem),
				targ = target, toff, attr = {},
				win = $elem.is('html,body');

			switch (typeof targ) {
				// A number will pass the regex 
				case 'number':
				case 'string':
					if (/^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ)) {
						targ = both(targ);
						// We are done
						break;
					}
					// Relative selector, no break!
					targ = $(targ, this);
				case 'object':
					// DOMElement / jQuery
					if (targ.is || targ.style)
					// Get the real position of the target 
						toff = (targ = $(targ)).offset();
			}
			$.each(settings.axis.split(''), function(i, axis) {
				var Pos = axis == 'x' ? 'Left' : 'Top',
					pos = Pos.toLowerCase(),
					key = 'scroll' + Pos,
					old = elem[key],
					max = $scrollTo.max(elem, axis);

				if (toff) {// jQuery / DOMElement
					attr[key] = toff[pos] + (win ? 0 : old - $elem.offset()[pos]);

					// If it's a dom element, reduce the margin
					if (settings.margin) {
						attr[key] -= parseInt(targ.css('margin' + Pos)) || 0;
						attr[key] -= parseInt(targ.css('border' + Pos + 'Width')) || 0;
					}

					attr[key] += settings.offset[pos] || 0;

					if (settings.over[pos])
					// Scroll to a fraction of its width/height
						attr[key] += targ[axis == 'x' ? 'width' : 'height']() * settings.over[pos];
				} else {
					var val = targ[pos];
					// Handle percentage values
					attr[key] = val.slice && val.slice(-1) == '%' ?
						parseFloat(val) / 100 * max
						: val;
				}

				// Number or 'number'
				if (/^\d+$/.test(attr[key]))
				// Check the limits
					attr[key] = attr[key] <= 0 ? 0 : Math.min(attr[key], max);

				// Queueing axes
				if (!i && settings.queue) {
					// Don't waste time animating, if there's no need.
					if (old != attr[key])
					// Intermediate animation
						animate(settings.onAfterFirst);
					// Don't animate this axis again in the next iteration.
					delete attr[key];
				}
			});

			animate(settings.onAfter);

			function animate(callback) {
				$elem.animate(attr, duration, settings.easing, callback && function() {
					callback.call(this, target, settings);
				});
			};

		}).end();
	};

	// Max scrolling position, works on quirks mode
	// It only fails (not too badly) on IE, quirks mode.
	$scrollTo.max = function(elem, axis) {
		var Dim = axis == 'x' ? 'Width' : 'Height',
			scroll = 'scroll' + Dim;

		if (!$(elem).is('html,body'))
			return elem[scroll] - $(elem)[Dim.toLowerCase()]();

		var size = 'client' + Dim,
			html = elem.ownerDocument.documentElement,
			body = elem.ownerDocument.body;

		return Math.max(html[scroll], body[scroll])
			 - Math.min(html[size], body[size]);

	};

	function both(val) {
		return typeof val == 'object' ? val : { top: val, left: val };
	};

})(jQuery);