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    <p>Here is your solution: (This also supports additional images).</p> <pre><code>var m = 0, imgs = ["images/bg.jpg", "images/bg_2.jpg"]; function changeDivImage() { document.body.style.backgroundImage = "url(" + imgs[m] + ")"; m = (m + 1) % imgs.length; } </code></pre> <p>Here is the <strong><a href="http://jsfiddle.net/CvEtq/" rel="nofollow">working code on jsFiddle</a></strong>. </p> <p>Here is the <strong><a href="http://jsfiddle.net/7VdAV/" rel="nofollow">jQuery version on jsFiddle</a></strong>.</p> <p><strong>UPDATE: <em>CROSS-FADING Version</em></strong></p> <p>Here is the <strong><a href="http://jsfiddle.net/ftdmw/" rel="nofollow">cross-fading jQuery version on jsFiddle</a></strong>.</p> <p>You wouldn't want the whole page (with all elements) to fade in/out. Only the bg should fade. So, this version has a div to be used as the <strong>background container</strong>. Its <strong>z-depth</strong> is arranged so that it will keep itself the bottom-most element on the page; and switch between its two children to create the cross-fade effect.</p> <p><strong>HTML:</strong></p> <pre><code>&lt;div id="bg"&gt; &lt;div id="bg-top"&gt;&lt;/div&gt; &lt;div id="bg-bottom"&gt;&lt;/div&gt; &lt;/div&gt; &lt;a id="bg-changer" href="#"&gt;change&lt;/a&gt; </code></pre> <p><strong>CSS:</strong></p> <pre><code>div#bg, div#bg-top, div#bg-bottom { display: block; position: fixed; width: 100%; /*height: 500px;*/ /* height is set by javascript on every window resize */ overflow: hidden; } div#bg { z-index: -99; } </code></pre> <p><strong>Javascript (jQuery):</strong></p> <pre><code>var m = 0, /* Array of background images. You can add more to it. */ imgs = ["images/bg.jpg", "images/bg_2.jpg"]; /* Toggles the background images with cross-fade effect. */ function changeDivImage() { setBgHeight(); var imgTop = imgs[m]; m = (m + 1) % imgs.length; var imgBottom = imgs[m]; $('div#bg') .children('#bg-top').show() .css('background-image', 'url(' + imgTop + ')') .fadeOut('slow') .end() .children('#bg-bottom').hide() .css('background-image', 'url(' + imgBottom + ')') .fadeIn('slow'); } /* Sets the background div height to (fit the) window height. */ function setBgHeight() { var h = $(window).height(); $('div#bg').height(h).children().height(h); } /* DOM ready event handler. */ $(document).ready(function(event) { $('a#bg-changer').click(function(event) { changeDivImage(); }); changeDivImage(); //fade in the first image when the DOM is ready. }); /* Window resize event handler. */ $(window).resize(function(event) { setBgHeight(); //set the background height everytime. }); </code></pre> <p>This could be improved more but it should give you an idea. </p>
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    1. POtoggle body background
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    1. USOnur Yıldırım
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    1. CONice use of `%` here.
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      1. USDerek 朕會功夫
    2. COThanks @Derek...
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    3. COanyway I an use this with fading the pictures in and out?
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