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    <p>I think you are refering to image opacity when a black background is behind the image. Am I right?</p> <p>If so, then make a div element right after the declaration of body, and set the div you created to have the same size as body. Set body to have black background.<br> Then when you hover over .first, .second or .third it will change the image of the div instead of body. Example:</p> <pre><code>$(document).ready(function() { var colorOrig= $("#yourDiv").css('background-image'); var imgOpacity = 0.5; $(".first").hover( function() { $("#yourDiv").css({ 'background-image': 'url(images/foto-de-skater.jpg)', opacity:imgOpacity }); }, function() { $("#yourDiv").css({ 'background-image': colorOrig, opacity:imgOpacity }); }); $(".second").hover( function() { $("#yourDiv").css({ 'background-image': 'url(images/girls.jpg)', opacity:imgOpacity }); }, function() { $("#yourDiv").css({ 'background-image': colorOrig, opacity:imgOpacity }); }); $(".third").hover( function() { $("#yourDiv").css({ 'background-image': 'url(images/inter0507fumoniCurvaSudRoma1973.jpg)', opacity:imgOpacity }); }, function() { $("#yourDiv").css({ 'background-image': colorOrig, opacity:imgOpacity }); });}); </code></pre> <p>EDIT:</p> <pre><code>$(document).ready(function() { function fadeImage (img) { $("body").stop(true).animate ({ opacity: 0 }, 'fast', function () { $(this).css ('background-image', img).animate ({ opacity: 1 }, 'fast'); }); } var colorOrig=$("body").css('background-image'); $(".first").hover( function() { fadeImage ('url(images/foto-de-skater.jpg)'); }, function() { fadeImage (colorOrig); }); $(".second").hover( function() { fadeImage ('url(images/girls.jpg)'); }, function() { fadeImage (colorOrig); }); $(".third").hover( function() { fadeImage ('url(images/inter0507fumoniCurvaSudRoma1973.jpg)'); }, function() { fadeImage (colorOrig); });}); </code></pre> <p>Latest fiddle: <a href="http://jsfiddle.net/7KWjz/21/" rel="nofollow">http://jsfiddle.net/7KWjz/21/</a> Full screen: <a href="http://jsfiddle.net/7KWjz/21/embedded/result/" rel="nofollow">http://jsfiddle.net/7KWjz/21/embedded/result/</a></p>
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    1. POCan't ga a fade in a hover in jQuery
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    1. UScode ninja
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    1. COThanks for your suggestion. Nevertheless, I wasn’t refering to the opacity. What I try to accomplish is to change the background image based on the mouse-over behavior of a visitor. So I want to start with a Supersized image with for instance 3 buttons. When a user goes over button 1, I would like the background image change to another image. Then when a user goes with the mouse over button 2, another background image needs to appear. And so on. All background images should have a fade in effect. Thanks already for the help. Highly appreciated.
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    2. COSee the Edited part of answer, that might be it..
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    3. COAlso if you are going to use multiple images, i strongly suggest you pre-load them so that when you click the button it shows instantly, not after the image is loaded. This can be achieved by making a hidden div with the images. This will force the browser to load them, and when you click .second it will fade out the current image, and replace it by the loaded one. Hope I did not confuse you thanks to my bad english ;)
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