var flexiBackground = function(){
	
	/**
		CONFIGURATION:
		Define the size of our background image
	*/
	var bgImageSize = {
		width : 1200,
		height : 800
	};
	
	/**
		Declare and define variables
	*/ 
	var $window,
		$body,
		imageID = "expando",
		tallClass = 'tall',
		wideClass = 'wide',
		fixedClass = 'fixedBG',
		$bgImage, $wrapper, img, url, imgAR;
		
	/**
		Are we dealing with ie6?
	*/
	var ie6 = ($.browser.msie && parseInt($.browser.version, 10) <= 6);
	
	/**
		Set up the action that happens on resize
	*/
	var resizeAction = function() {
		var win = {
			height : $window.height(),
			width : $window.width()
		};
		
		// The current aspect ratio of the window
		var winAR = win.width / win.height;

		// Determine if we need to show the image and whether it needs to stretch tall or wide
		// alert(win.width+' < '+bgImageSize.width+' && '+win.height+' < '+bgImageSize.height+' - '+screen.availHeight+' -- '+screen.availWidth+"----"+$(document).height());
		
		if (win.width < bgImageSize.width && win.height < bgImageSize.height) {
			$body
				.removeClass(wideClass)
				.removeClass(tallClass)
				.removeClass(fixedClass);
			if(bgImageSize.height < $(document).height()){
				
				$body
					.addClass(fixedClass);
			}
			
			/*$body
				.addClass(fixedClass);	
			*/
			//alert(screen.availHeight+' < '+bgImageSize.height);
		} else if ((win.width < bgImageSize.width && win.height >= bgImageSize.height) || (winAR < imgAR)) {
			$body
				.removeClass(wideClass)
				.addClass(tallClass)
				.addClass(fixedClass);
			// Center the image
			$bgImage.css('left', Math.min(((win.width - bgImageSize.width) / 2), 0));
		} else if (win.width >= bgImageSize.width) {
			$body
				.addClass(wideClass)
				.removeClass(tallClass)
				.addClass(fixedClass);
			$bgImage.css('left', 0);
		}
		
		// Need to fix the height of the wrapper for IE6
		if (ie6) {
			$wrapper.css('height', win.height);
		}
	};
	
	return {
		
		/*
			Sets up the basic functionality
		*/
		initialize : function() {
			
			// Grab elements we'll reference throughout
			$window = $(window);
			$body = $('body');
			url = $body.css('background-image').replace(/^url\(("|')?|("|')?\);?$/g, '') || false;	
			
			if (!url || url === "none" || url === "")  return;
			
			var img = new Image();
			img.onload = function() {
				bgImageSize.width = this.width;
				bgImageSize.height = this.height;
			
				// No need for any of this if the screen isn't bigger than the background image
				if ($(document).width() <= bgImageSize.width && $(document).height() <= bgImageSize.height) {
					return;
				}
				
				// Parse out the URL of the background image and drop out if we don't have one
				if (!url || url === "none" || url === "") {
					return;
				} else {
					// check for 'noscale' occurance in url -> return if it occures
					var scaling = url.indexOf("noscale");
					if(scaling !== -1) return;
				}
				
				// Get the aspect ratio of the image
				imgAR = bgImageSize.width / bgImageSize.height;
	
				// Create a new image element
				$bgImage = $('<img />')
							.attr('src', url)
							.attr('id', imageID);
				
				// Create a wrapper and append the image to it.
				// The wrapper ensures we don't get scrollbars.
				$wrapper = $('<div></div>')
								.css({
									'overflow' : 'hidden',
									'width' : '100%',
									'height' : '100%',
									'z-index' : '-1'
								})
								.append($bgImage)
								.appendTo($body);
								
				// IE6 Doesn't do position: fixed, so let's fake it out.
				// We'll apply a class which gets used in the CSS to emulate position: fixed
				// Otherwise, we'll simply used position: fixed.
				if (ie6) {
					$wrapper.addClass('ie6fixed');
				} else {
					$wrapper.css({
						'position' : 'fixed',
						'top' : 0,
						'left' : 0,
						'z-index' : -4
					});
				}
				
				// Set up a resize listener to add/remove classes from the body 
				$window.bind('resize', resizeAction);
	
				// Set it up by triggering a resize
				$window.trigger('resize');
			}
			img.src = url;
			
		}
	};
}();

$(document).ready(flexiBackground.initialize);