JezK

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( jQuery ){
	var jQuerywindow = jQuery(window);
	var windowHeight = jQuerywindow.height();

jQuerywindow.resize(function () {
		windowHeight = jQuerywindow.height();
	});

jQuery.fn.parallax = function(xpos, speedFactor, outerHeight) {
		var jQuerythis = jQuery(this);
		var getHeight;
		var firstTop;
		var paddingTop = 0;
		
		//get the starting position of each element to have parallax applied to it		
		jQuerythis.each(function(){
		    firstTop = jQuerythis.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 = jQuerywindow.scrollTop();

jQuerythis.each(function(){
				var jQueryelement = jQuery(this);
				var top = jQueryelement.offset().top;
				var height = getHeight(jQueryelement);

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

jQuerythis.css('backgroundPosition', xpos + " " + Math.round((top - pos) * speedFactor) + "px");

});
		}

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

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