(function($) {
	$.fn.extend( {
		boxen : function(url, options) {
			switch (typeof url) {
			case 'object':
				options = url;
				break;
			case 'string':
				options = $.extend( {}, {
					url : url,
					urlAttribute : null
				}, options);
				break;
			}
			return this.click(function(e) {
				$.Boxen.open(this, options);
				return false;
			});
		}
	});
	$.Boxen = {
		defaults : {
			urlParams : {},
			showTitleBar : true,
			showCloseButton : true,
			title : null,
			titleAttribute : 'title',
			closeButtonText : null,
			width : 700,
			height : 370,
			url : null,
			urlAttribute : 'href',
			overlayOpacity : 0.8,
			modal : false,
			postOpen : function(contentAreaElement) {
			},
			postClose : function() {
			}
		},
		bigIFrame : null,
		overlay : null,
		container : null,
		options : null,
		titleBar : null,
		closeButton : null,
		contentWindow : null,
		contentArea : null,
		ie6 : false,
		setOptions : function(options) {
			this.options = $.extend( {}, this.defaults, options || {});
			return this;
		},
		getFullUrl : function() {
			var url = this.options.url;
			url += url.indexOf('?') == -1 ? '?' : '&';
			return url += $.param(this.options.urlParams);
		},
		init : function() {
			_this = this;
			this.isIE6 = $.browser.msie && parseInt($.browser.version) < 7;
			if ($.browser.opera) {
				$.support.opacity = true;
			}
			$('#boxen_overlay, #boxen_container').remove();
			this.overlay = $('<div>').attr('id', 'boxen_overlay').css( {
				opacity : this.options.overlayOpacity,
				display : 'none',
				position : 'absolute',
				top : 0,
				left : 0,
				zIndex : 10000
			});
			if (!this.options.modal) {
				this.overlay.click(function(e) {
					$.Boxen.close();
					return false;
				});
			}
			this.container = $('<div>').attr('id', 'boxen_container').width(
					this.options.width).height(this.options.height).css( {
				position : 'absolute',
				left : '50%',
				top : '50%',
				marginLeft : Math.round(this.options.width / -2) + 'px',
				marginTop : Math.round(this.options.height / -2) + 'px',
				display : 'none',
				zIndex : 10001
			});
			if (this.isIE6) {
				this.bigIFrame = $('<iframe>').attr('id', 'boxen_big_iframe')
						.css( {
							zIndex : 9999,
							position : 'absolute',
							top : 0,
							left : 0,
							opacity : 0
						}).appendTo('body');
				this._sizeOverlay();
				this._centreContent();
				$(window).bind('scroll.Boxen', function(e) {
					_this._centreContent();
				}).bind('resize.Boxen', function(e) {
					_this._sizeOverlay();
					_this._centreContent();
				});
			} else {
				this.overlay.css( {
					position : 'fixed',
					width : '100%',
					height : '100%'
				});
				this.container.css('position', 'fixed');
			}
			this.overlay.appendTo('body');
			this.container.appendTo('body');
			this.contentWindow = $('<div>').attr('id', 'boxen_content')
					.appendTo(this.container);
			if (this.options.showTitleBar) {
				this.titleBar = $('<div>').attr('id', 'boxen_titlebar').append(
						$('<span>').attr('id', 'boxen_title').html(
								this.options.title)).appendTo(
						this.contentWindow);
			} else {
				this.titleBar = null;
			}
			if (this.options.showCloseButton) {
				this.closeButton = $('<a>').attr( {
					href : '#',
					id : 'boxen_close_button'
				}).click(function(e) {
					$.Boxen.close();
					return false;
				}).appendTo(this.contentWindow);
				if (this.options.closeButtonText) {
					this.closeButton.append($('<span>').html(
							this.options.closeButtonText));
				}
			} else {
				this.closeButton = null;
			}
			this.contentArea = $('<div>').attr('id', 'boxen_content_area')
					.appendTo(this.contentWindow);
			return this;
		},
		show : function(callback) {
			this.overlay.fadeIn('fast');
			this.container.fadeIn('fast', function() {
				var _this = $.Boxen;
				if (null !== _this.options.url) {
					var iFrame = $('<iframe>').attr( {
						id : 'boxen_iframe_content_' + new Date().getTime(),
						width : _this.getContentAreaWidth(),
						height : _this.getContentAreaHeight(),
						frameborder : 0,
						src : _this.getFullUrl()
					}).appendTo(_this.contentArea);
				} else {
					_this.contentArea.width(_this.getContentAreaWidth())
							.height(_this.getContentAreaHeight());
				}
				_this.options.postOpen(_this.getContentAreaElement());
			});
			return this;
		},
		close : function() {
			try {
				if (this.isIE6) {
					$(window).unbind('scroll.Boxen').unbind('resize.Boxen');
					throw 'IE6';
				}
				this.container.fadeOut('fast', function() {
					$(this).remove();
				});
				this.overlay.fadeOut('fast', function() {
					$(this).remove();
				});
			} catch (e) {
				$('#boxen_big_iframe, #boxen_overlay, #boxen_container')
						.remove();
			}
			this.options.postClose();
			return this;
		},
		open : function(domElement, options) {
			this.setOptions(options);
			this.options.title = this.options.titleAttribute
					&& $(domElement).attr(this.options.titleAttribute)
					|| this.options.title;
			this.options.url = this.options.urlAttribute
					&& $(domElement).attr(this.options.urlAttribute)
					|| this.options.url;
			this.init().show();
			return this;
		},
		_centreContent : function() {
			if (this.options.height < $(window).height()) {
				var topMargin = Math.round(this.options.height / -2)
						+ $(document).scrollTop();
				this.container.css( {
					marginTop : topMargin + 'px'
				});
			}
		},
		_sizeOverlay : function() {
			this.bigIFrame.css( {
				width : ($(document).width() - 21) + 'px',
				height : ($(document).height() - 4) + 'px'
			});
			this.overlay.css( {
				width : ($(document).width() - 21) + 'px',
				height : ($(document).height() - 4) + 'px'
			});
		},
		getContentAreaElement : function() {
			return this.contentArea.get(0);
		},
		getContentAreaHeight : function() {
			return this.titleBar ? this.options.height
					- this.titleBar.outerHeight() : this.options.height;
		},
		getContentAreaWidth : function() {
			return this.options.width;
		}
	};
})(jQuery);