// JavaScript Document

;(function( $ ){



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

		$scrollTo.window().scrollTo( target, duration, settings );

	};



	$scrollTo.defaults = {

		axis:'y',

		duration:1

	};



	//returns the element that needs to be animated to scroll the window

	$scrollTo.window = function(){

		return $( $.browser.safari ? 'body' : 'html' );

	};



	$.fn.scrollTo = function( target, duration, settings ){

		if( typeof duration == 'object' ){

			settings = duration;

			duration = 0;

		}

		settings = $.extend( {}, $scrollTo.defaults, settings );

		duration = duration || settings.speed || settings.duration;//speed is still recognized for backwards compatibility

		settings.queue = settings.queue && settings.axis.length > 1;//make sure the settings are given right

		if( settings.queue )

			duration /= 2;//let's keep the overall speed, the same.

		settings.offset = both( settings.offset );

		settings.over = both( settings.over );



		return this.each(function(){

			var elem = this, $elem = $(elem),

				t = target, toff, attr = {},

				win = $elem.is('html,body');

			switch( typeof t ){

				case 'number'://will pass the regex

				case 'string':

					if( /^([+-]=)?\d+(px)?$/.test(t) ){

						t = both( t );

						break;//we are done

					}

					t = $(t,this);// relative selector, no break!

				case 'object':

					if( t.is || t.style )//DOM/jQuery

						toff = (t = $(t)).offset();//get the real position of the target 

			}

			$.each( settings.axis.split(''), function( i, axis ){

				var Pos	= axis == 'x' ? 'Left' : 'Top',

					pos = Pos.toLowerCase(),

					key = 'scroll' + Pos,

					act = elem[key],

					Dim = axis == 'x' ? 'Width' : 'Height',

					dim = Dim.toLowerCase();



				if( toff ){//jQuery/DOM

					attr[key] = toff[pos] + ( win ? 0 : act - $elem.offset()[pos] );



					if( settings.margin ){//if it's a dom element, reduce the margin

						attr[key] -= parseInt(t.css('margin'+Pos)) || 0;

						attr[key] -= parseInt(t.css('border'+Pos+'Width')) || 0;

					}

					

					attr[key] += settings.offset[pos] || 0;//add/deduct the offset

					

					if( settings.over[pos] )//scroll to a fraction of its width/height

						attr[key] += t[dim]() * settings.over[pos];

				}else

					attr[key] = t[pos];//remove the unnecesary 'px'



				if( /^\d+$/.test(attr[key]) )//number or 'number'

					attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max(Dim) );//check the limits



				if( !i && settings.queue ){//queueing each axis is required					

					if( act != attr[key] )//don't waste time animating, if there's no need.

						animate( settings.onAfterFirst );//intermediate animation

					delete attr[key];//don't animate this axis again in the next iteration.

				}

			});			

			animate( settings.onAfter );			



			function animate( callback ){

				$elem.animate( attr, duration, settings.easing, callback && function(){

					callback.call(this, target);

				});

			};

			function max( Dim ){

				var el = win ? $.browser.opera ? document.body : document.documentElement : elem;

				return el['scroll'+Dim] - el['client'+Dim];

			};

		});

	};



	function both( val ){

		return typeof val == 'object' ? val : { top:val, left:val };

	};



})( jQuery );