/**
 * 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
  */
;(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
	};
	$scrollTo.window = function( scope ){
		return $(window)._scrollable();
	};
	$.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 );
		duration = duration || settings.speed || settings.duration;
		settings.queue = settings.queue && settings.axis.length > 1;
		if (settings.queue) 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 = $elem.is('html,body');
			switch( typeof targ ){
				case 'number':
				case 'string':
					if (/^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ)) {
						targ = both(targ);
						break;
					}
					targ = $(targ,this);
				case 'object': if (targ.is || targ.style) 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) {
					attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] );
					if( settings.margin ){
						attr[key] -= parseInt(targ.css('margin'+Pos)) || 0;
						attr[key] -= parseInt(targ.css('border'+Pos+'Width')) || 0;
					}
					attr[key] += settings.offset[pos] || 0;
					if (settings.over[pos]) attr[key] += targ[axis=='x'?'width':'height']() * settings.over[pos];
				} else { 
					var val = targ[pos];
					attr[key] = val.slice && val.slice(-1) == '%' ? parseFloat(val) / 100 * max : val;
				}
				if (/^\d+$/.test(attr[key])) attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max );
				if (!i && settings.queue) {
					if (old != attr[key]) animate( settings.onAfterFirst );
					delete attr[key];
				}
			});
			animate( settings.onAfter );			
			function animate( callback ){
				$elem.animate( attr, duration, settings.easing, callback && function(){
					callback.call(this, target, settings);
				});
			};
		}).end();
	};
	$scrollTo.max = function( elem, axis ){
		var Dim = axis == 'x' ? 'Width' : 'Height', scroll = 'scroll'+Dim;
		if (!$(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);