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Edit File: parallax.js

/*
Plugin: jQuery Parallax
Version 1.1.3
Author: Ian Lunn
Twitter: @IanLunn
Author URL: http://www.ianlunn.co.uk/
Plugin URL: http://www.ianlunn.co.uk/plugins/jquery-parallax/

Dual licensed under the MIT and GPL licenses:
http://www.opensource.org/licenses/mit-license.php
http://www.gnu.org/licenses/gpl.html
*/

(function( $ ){
	var $window = $(window);
	var windowHeight = $window.height();

$window.resize(function () {
		windowHeight = $window.height();
	});

$.fn.parallax = function(xpos, speedFactor, outerHeight) {
		var $this = $(this);
		var getHeight;
		var firstTop;
		
		//get the starting position of each element to have parallax applied to it		
		$this.each(function(){
		    firstTop = $this.offset().top;
		});

if (outerHeight) {
			getHeight = function(jqo) {
				return jqo.outerHeight(true);
			};
		} else {
			getHeight = function(jqo) {
				return jqo.height();
			};
		}
			
		// setup defaults if arguments aren't specified
		if (arguments.length < 1 || xpos === null) {
			xpos = '50%';
		}
		if (arguments.length < 2 || speedFactor === null) {
			speedFactor = 0.1;
		}
		if (arguments.length < 3 || outerHeight === null) {
			outerHeight = true;
		}
		
		// function to be called whenever the window is scrolled or resized
		function update(){
			var pos = $window.scrollTop();

$this.each(function(){
				var $element = $(this);
				var top = $element.offset().top;
				var height = getHeight($element);

// Check if totally above or totally below viewport
				if (top + height < pos || top > pos + windowHeight) {
					return;
				}

$this.css('backgroundPosition', xpos + ' ' + Math.round((firstTop - pos) * speedFactor) + 'px');
			});
		}

$window.bind('scroll', update).resize(update);
		update();
	};
})(jQuery);