/*
	Background Stretcher 2 jQuery Plugin
	© 2010 cyberward.net
	This is a heavily modified version of the 1.2v Background Stretcher
	jQuery Plugin found at ajaxBlender.
	The stop/start funcions and all support for albums was added. 

	Version: 2.0
	
	Background Stretcher jQuery Plugin
	© 2009 ajaxBlender.com
	For any questions please visit www.ajaxblender.com 
	or email us at support@ajaxblender.com
	
	Version: 1.2
*/
;(function($){
	var container = null;
	var allImgs = '', allLIs = '', containerStr = '';
	var _bgStretcherPause = false;
	var _bgStretcherTm = null;
	
	$.fn.bgStretcher = function(settings){
		settings = $.extend({}, $.fn.bgStretcher.defaults, settings);
		$.fn.bgStretcher.settings = settings;
		
		function _build(){
			_genHtml();
			
			containerStr = '#' + settings.imageContainer;
			container = $(containerStr);
			allImgs = '#' + settings.imageContainer + ' IMG';
			allLIs = '#' + settings.imageContainer + ' LI';
			
			$(allLIs).hide();
			$(allLIs + ':first').show().addClass('bgs-current');
			
			if(!container.length){ return; }
			$(window).resize(_resize);
			
			if(settings.slideShow && $(allImgs).length > 1){
				_bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', settings.nextSlideDelay);
			}
			_resize();
		};
		
		function _resize(){
			var winW = $(window).width();
			var winH = $(window).height();
			var imgW = 0, imgH = 0;

			container.width(winW);
			container.height(winH);
			
			if(!settings.resizeProportionally){
				imgW = winW;
				imgH = winH;
			} else {
				var initW = settings.imageWidth, initH = settings.imageHeight;
				var ratio = initH / initW;
				
				imgW = winW;
				imgH = winW * ratio;
				
				if(imgH < winH){
					imgH = winH;
					imgW = imgH / ratio;
				}
			}
			if(!settings.resizeAnimate){
				$(allImgs).width(imgW).height(imgH);
			} else {
				$(allImgs).animate({width: imgW, height: imgH}, 'normal');
			}
		};
		
		function _genHtml(){
			var code = '<div id="' + settings.imageContainer + '" class="bgstretcher"><ul>';
			jQuery.each(settings.albums, function(album, imageArray) {
				for(i = 0; i < imageArray.length; i++){
					code += '<li class="' + album + '"><img src="' + imageArray[i] + '" alt="" /></li>';
				}
			});
			code += '</ul></div>';
			$(code).appendTo('body');
		};
		_build();
	};
	
	$.fn.bgStretcher.play = function(){
       _bgStretcherPause = false;
       $.fn.bgStretcher._clearTimeout();
       $.fn.bgStretcher.slideShow();
	};
	
	$.fn.bgStretcher._clearTimeout = function(){
       if(_bgStretcherTm != null){
           clearTimeout(_bgStretcherTm);
           _bgStretcherTm = null;
       }
	}
	
	$.fn.bgStretcher.pause = function(){
	   _bgStretcherPause = true;
	   $.fn.bgStretcher._clearTimeout();
	};
	
	$.fn.bgStretcher.slideShow = function(){
		var current = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album).filter('.bgs-current');
		var next = current.next('.'+$.fn.bgStretcher.settings.album);
		if(!next.length){
			next = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album+':first');
		}
		$(containerStr + ' LI').removeClass('bgs-current');
		next.addClass('bgs-current');
		next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );
		if(!_bgStretcherPause){
		  _bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', $.fn.bgStretcher.settings.nextSlideDelay);
		}
	};
	
	$.fn.bgStretcher.next = function(){
		var current = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album).filter('.bgs-current');
		var next = current.next('.'+$.fn.bgStretcher.settings.album);
		if(!next.length){
			next = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album+':first');
		}
		$(containerStr + ' LI').removeClass('bgs-current');
		next.addClass('bgs-current');
		next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );		
	};
	
	$.fn.bgStretcher.previous = function(){
		var current = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album).filter('.bgs-current');
		var previous = current.prev('.'+$.fn.bgStretcher.settings.album);
		if(!previous.length){
			previous = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album+':last');
		}
		$(containerStr + ' LI').removeClass('bgs-current');
		previous.addClass('bgs-current');
		previous.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );		
	};
	
	$.fn.bgStretcher.changeAlbum = function(album){
		$.fn.bgStretcher.settings.album = album;
		var current = $(containerStr + ' LI.bgs-current');
		var next = $(containerStr + ' LI.'+$.fn.bgStretcher.settings.album+":first");
		next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );
		if(!_bgStretcherPause){
			$.fn.bgStretcher.play();
		}
	};
	
	/*  Default Settings  */
	$.fn.bgStretcher.defaults = {
		imageContainer:             'bgstretcher',
		resizeProportionally:       true,
		resizeAnimate:              false,
		albums: 					[],
		album: 						'',
		imageWidth:                 1024,
		imageHeight:                768,
		nextSlideDelay:             10000,
		slideShowSpeed:             800,
		slideShow:                  true
	};
	$.fn.bgStretcher.settings = {};
})(jQuery);
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