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    <p>@andy, here is Tom Th's idea worked up; ie a js constructor function, from which you can instantiate multiple instances :</p> <pre><code>function bgScroller(options) { var settings = { containerID: '', //id of the scroller's containing element scrollSpeed: 50, //Speed in milliseconds step: 1, //How many pixels to move per step imageHeight: 0, //Background image height headerHeight: 0, //How tall the header is. autoStart: true }; if(options) { jQuery.extend(settings, options); } var current = 0, // The current pixel row restartPosition = -(settings.imageHeight - settings.headerHeight), //The pixel row where to start a new loop interval = null, $container = jQuery('#' + settings.containerID), that = {}; if(!$container.length || !settings.imageHeight || !settings.headerHeight) { return false; //nothing will work without these settings so let's not even try } function setBg() { $container.css("background-position", "0 " + current + "px"); } function scrollBg(){ current -= settings.step;//Go to next pixel row. //If at the end of the image, then go to the top. if (current &lt;= restartPosition){ current = 0; } setBg(); } that.reset = function() { that.stop(); current = 0; setBg(); } that.start = function() { interval = setInterval(scrollBg, settings.scrollSpeed); }; that.stop = function(){ clearInterval(interval); }; that.reset(); if(settings.autoStart) { that.start(); } return that; } </code></pre> <p>Parameters are passed as properties of an object literal "map", overriding the hard-coded defaults in the constructor. For any parameters not included, the default values will be used. Here's a couple of examples :</p> <pre><code>var headerScroller = new bgScroller({ containerID: "header", scrollSpeed: 70, //Speed in milliseconds imageHeight: 4300, //Background image height headerHeight: 300, //How tall the header is. }); var otherScroller = new bgScroller({ containerID: "myOtherDiv", scrollSpeed: 30, //Speed in milliseconds imageHeight: 2800, //Background image height headerHeight: 200, //How tall the header is. }); </code></pre> <p>I have included three public methods; <code>.reset()</code>, <code>.start()</code> and <code>.stop()</code>, which provide limited control over scrollers after instantiation. Use as follows:</p> <ul> <li><code>headerScroller.stop();</code></li> <li><code>headerScroller.reset();</code></li> <li><code>headerScroller.start();</code></li> </ul> <p>Notes:</p> <ul> <li>Working demo <a href="http://jsfiddle.net/VfMkt/3/" rel="nofollow">here</a>.</li> <li>Dependencies: jQuery 1.0 or later</li> <li><code>.reset()</code> calls <code>.stop()</code> automatically so there's no need to call <code>.stop()</code> beforehand. </li> <li>No provision is made for changing settings after instantiation but this would be possible with a little more thought.</li> <li>jQuery plugin would be similar but would take a little more time to develop (with little advantage).</li> </ul>
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    1. PONeed more than one of the same jQuery effect on same page
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    1. COWow! What an amazing answer, beetroot. Thanks for that. The only problem is as soon as i paste it in I get a code error on this line var current: 0, // The current pixel row You'll have to forgive me but most of what you said went over my head.
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    2. CONow tested and debugged. Answer above edited to reflect the revised code. See link to Demo in the notes.
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    3. COI cannot get this to work outside of jsfiddle in any way. Here's my code http://pastebin.com/pSQjkuvR Works great in jsfiddle and can change it to my liking but it won't work on my own docs?
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