(function( $, undefined ) {
		
	/*
	 * slider object.
	 */
	$.slider 				= function( options, element ) {
	
		this.$el	= $( element );
		
		this._init( options );
		
	};
	
	$.slider.defaults 		= {
		current		: 0, 	// index of current slide
		bgincrement	: 50,	// increment the bg position (parallax effect) when sliding
		autoplay	: false,// slideshow on / off
		interval	: 4000  // time between transitions
    };
	
	$.slider.prototype 	= {
		_init 				: function( options ) {
			
			this.options 		= $.extend( true, {}, $.slider.defaults, options );
			
			this.$slides		= this.$el.children('div.da-slide');
			this.slidescount	= this.$slides.length;
			
			this.current		= this.options.current;
			
			if( this.current < 0 || this.current >= this.slidescount ) {
			
				this.current	= 0;
			
			}
			
			this.$slides.eq( this.current ).addclass( 'da-slide-current' );
			
			var $navigation		= $( '<nav class="da-dots"/>' );
			for( var i = 0; i < this.slidescount; ++i ) {
			
				$navigation.append( '<span/>' );
			
			}
			$navigation.appendto( this.$el );
			
			this.$pages			= this.$el.find('nav.da-dots > span');
			this.$navnext		= this.$el.find('span.da-arrows-next');
			this.$navprev		= this.$el.find('span.da-arrows-prev');
			
			this.isanimating	= false;
			
			this.bgpositer		= 0;
			
			this.cssanimations	= modernizr.cssanimations;
			this.csstransitions	= modernizr.csstransitions;
			
			if( !this.cssanimations || !this.cssanimations ) {
				
				this.$el.addclass( 'da-slider-fb' );
			
			}
			
			this._updatepage();
			
			// load the events
			this._loadevents();
			
			// slideshow
			if( this.options.autoplay ) {
			
				this._startslideshow();
			
			}
			
		},
		_navigate			: function( page, dir ) {
			
			var $current	= this.$slides.eq( this.current ), $next, _self = this;
			
			if( this.current === page || this.isanimating ) return false;
			
			this.isanimating	= true;
			
			// check dir
			var classto, classfrom, d;
			
			if( !dir ) {
			
				( page > this.current ) ? d = 'next' : d = 'prev';
			
			}
			else {
			
				d = dir;
			
			}
				
			if( this.cssanimations && this.cssanimations ) {
				
				if( d === 'next' ) {
				
					classto		= 'da-slide-toleft';
					classfrom	= 'da-slide-fromright';
					++this.bgpositer;
				
				}
				else {
				
					classto		= 'da-slide-toright';
					classfrom	= 'da-slide-fromleft';
					--this.bgpositer;
				
				}
				
				this.$el.css( 'background-position' , this.bgpositer * this.options.bgincrement + '% 0%' );
			
			}
			
			this.current	= page;
			
			$next			= this.$slides.eq( this.current );
			
			if( this.cssanimations && this.cssanimations ) {
			
				var rmclasses	= 'da-slide-toleft da-slide-toright da-slide-fromleft da-slide-fromright';
				$current.removeclass( rmclasses );
				$next.removeclass( rmclasses );
				
				$current.addclass( classto );
				$next.addclass( classfrom );
				
				$current.removeclass( 'da-slide-current' );
				$next.addclass( 'da-slide-current' );
				
			}
			
			// fallback
			if( !this.cssanimations || !this.cssanimations ) {
				
				$next.css( 'left', ( d === 'next' ) ? '100%' : '-100%' ).stop().animate( {
					left : '0%'
				}, 1000, function() { 
					_self.isanimating = false; 
				});
				
				$current.stop().animate( {
					left : ( d === 'next' ) ? '-100%' : '100%'
				}, 1000, function() { 
					$current.removeclass( 'da-slide-current' ); 
				});
				
			}
			
			this._updatepage();
			
		},
		_updatepage			: function() {
		
			this.$pages.removeclass( 'da-dots-current' );
			this.$pages.eq( this.current ).addclass( 'da-dots-current' );
		
		},
		_startslideshow		: function() {
		
			var _self	= this;
			
			this.slideshow	= settimeout( function() {
				
				var page = ( _self.current < _self.slidescount - 1 ) ? page = _self.current + 1 : page = 0;
				_self._navigate( page, 'next' );
				
				if( _self.options.autoplay ) {
				
					_self._startslideshow();
				
				}
			
			}, this.options.interval );
		
		},
		page				: function( idx ) {
			
			if( idx >= this.slidescount || idx < 0 ) {
			
				return false;
			
			}
			
			if( this.options.autoplay ) {
			
				cleartimeout( this.slideshow );
				this.options.autoplay	= false;
			
			}
			
			this._navigate( idx );
			
		},
		_loadevents			: function() {
			
			var _self = this;
			
			this.$pages.on( 'click.cslider', function( event ) {
				
				_self.page( $(this).index() );
				return false;
				
			});
			
			this.$navnext.on( 'click.cslider', function( event ) {
				
				if( _self.options.autoplay ) {
				
					cleartimeout( _self.slideshow );
					_self.options.autoplay	= false;
				
				}
				
				var page = ( _self.current < _self.slidescount - 1 ) ? page = _self.current + 1 : page = 0;
				_self._navigate( page, 'next' );
				return false;
				
			});
			
			this.$navprev.on( 'click.cslider', function( event ) {
				
				if( _self.options.autoplay ) {
				
					cleartimeout( _self.slideshow );
					_self.options.autoplay	= false;
				
				}
				
				var page = ( _self.current > 0 ) ? page = _self.current - 1 : page = _self.slidescount - 1;
				_self._navigate( page, 'prev' );
				return false;
				
			});
			
			if( this.csstransitions ) {
			
				if( !this.options.bgincrement ) {
					
					this.$el.on( 'webkitanimationend.cslider animationend.cslider oanimationend.cslider', function( event ) {
						
						if( event.originalevent.animationname === 'torightanim4' || event.originalevent.animationname === 'toleftanim4' ) {
							
							_self.isanimating	= false;
						
						}	
						
					});
					
				}
				else {
				
					this.$el.on( 'webkittransitionend.cslider transitionend.cslider otransitionend.cslider', function( event ) {
					
						if( event.target.id === _self.$el.attr( 'id' ) )
							_self.isanimating	= false;
						
					});
				
				}
			
			}
			
		}
	};
	
	var logerror 			= function( message ) {
		if ( this.console ) {
			console.error( message );
		}
	};
	
	$.fn.cslider			= function( options ) {
	
		if ( typeof options === 'string' ) {
			
			var args = array.prototype.slice.call( arguments, 1 );
			
			this.each(function() {
			
				var instance = $.data( this, 'cslider' );
				
				if ( !instance ) {
					logerror( "cannot call methods on cslider prior to initialization; " +
					"attempted to call method '" + options + "'" );
					return;
				}
				
				if ( !$.isfunction( instance[options] ) || options.charat(0) === "_" ) {
					logerror( "no such method '" + options + "' for cslider instance" );
					return;
				}
				
				instance[ options ].apply( instance, args );
			
			});
		
		} 
		else {
		
			this.each(function() {
			
				var instance = $.data( this, 'cslider' );
				if ( !instance ) {
					$.data( this, 'cslider', new $.slider( options, this ) );
				}
			});
		
		}
		
		return this;
		
	};
	
})( jquery );