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Editorial Team
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Asked: 2026-05-11T20:18:39+00:00

<html> <head> <style type=text/css> div#bg1 { height: 159px; width: 800px; margin-left: auto; margin-right: auto;

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<html>
    <head>
        <style type="text/css">
            div#bg1 {
                height:             159px;
                width:              800px;
                margin-left:        auto;
                margin-right:       auto;
                background-image:   url('images/bg1.jpg');
                background-repeat:  no-repeat;
                background-position:center center;
                position:           relative;
                z-index:            3;
            }
            div#bg2 {
                height:             159px;
                width:              800px;
                margin-left:        auto;
                margin-right:       auto;
                background-image:   url('images/bg2.jpg');
                background-repeat:  no-repeat;
                background-position:center center;
                position:           relative;
                z-index:            2;
                margin-top:         -159px;
            }
        </style>
        <script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js"></script>
        <script type="text/javascript">
            function Animate_2() 
            {
                $("div#bg1").animate({opacity: 100}, 2000);
                $("div#bg2").animate({opacity: 0  }, 2000);
                setTimeout(Animate_1, 5000);
            }

            function Animate_1() 
            {
                $("div#bg1").animate({opacity: 0  }, 2000);
                $("div#bg2").animate({opacity: 100}, 2000);
                setTimeout(Animate_2, 5000);
            }

            $(function()
            {
                /* Start cycle */
                setTimeout(Animate_1, 5000);
            });
        </script>
    </head>
    <body>
        <div id="bg1"></div>
        <div id="bg2"></div>
    </body>
</html>

Animate_1() works fine, but Animate_2() will just display the bg2.jpg without animating the opacity.. This is the same in IE and Firefox..

Why is this >??

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1 Answer

  1. Editorial Team

    Your real problem is that opacity is a scale of 0 to 1, not 0 to 100. But here are some slight improvements:

    You could simplify the code a lot too as you’ve just got one image on top of another.

        <script type="text/javascript">
        var shown = true;

        function toggleFront() {
            shown = !shown;
            $("div#bg1").animate({opacity: shown*1}, 200);
            window.setTimeout(toggleFront, 1000);
        }

        $(function() {
            /* Start cycle */
            window.setTimeout(toggleFront, 500);
        });
    </script>

    I’ve messed with your timing values to show it faster.

    Or fix it. You need window. before setTimeout. Simple fix.

        <script type="text/javascript">
        function Animate_2() 
        {
            $("div#bg1").animate({opacity: 1}, 2000);
            $("div#bg2").animate({opacity: 0  }, 2000);
            window.setTimeout(Animate_1, 5000);
        }

        function Animate_1() 
        {
            $("div#bg1").animate({opacity: 0  }, 2000);
            $("div#bg2").animate({opacity: 1}, 2000);
            window.setTimeout(Animate_2, 5000);
        }

        $(function()
        {
            /* Start cycle */
            window.setTimeout(Animate_1, 5000);
        });
    </script>
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