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Create JavaScript slide show loop without jQuery

Possible duplicate:
trying to create a simple slide show method in Javascript

I learned how to make a slide show with a carousel script using JavaScript. I think it’s better to learn it from the main than just make something out of the framework (instant script), but I'm a newbie. I am writing this script using my technique, but I think it is horrible.

OK, here is my question: I don’t know how to make this slide show cycle, can anyone help me? Thanks

<!DOCTYPE html>
<html>
<head>
    <style type="text/css">
        #wrapper {
        width:400px;
        height:140px;
        position:absolute;
        left:50%;
        top:50%;
        margin: -70px 0 0 -200px;
        background: #383838;
        overflow: hidden;
        }

        #abc-container {
        position: absolute;
        width:1200px;
        height:140px;
        }

        #a {
        width:400px;
        height:140px;
        background: #FF0000;
        float: left;
        }

        #b {
        width:400px;
        height:140px;
        background: #FFFF00;
        float: left;
        }

        #c {
        width:400px;
        height:140px;
        background: #00FFFF;
        float: left;    
        }
    </style>
</head>
<body>
    <div id="wrapper">
        <div id="abc-container">
            <div id="a"></div>
            <div id="b"></div>
            <div id="c"></div>
        </div>
    </div>
    <div id="asas"></div>
    <div id="asass"></div>
    <script type="text/javascript">
        var runCarousel, runTimer;
        firstval = 0;
        secondval = 0;

        function Carousel(){
        firstval += 10;
        document.getElementById('abc-container').style.left = "-" + firstval + "px";
        document.getElementById('asas').innerHTML = "-" + firstval;
            if(firstval == 400)
            {
                StopRun();
                StartTimer()
                return;
            }
            if(firstval == 800)
            {
                StopRun();
                StartTimer()
                return;
            }
        runCarousel = setTimeout(Carousel, 10);
        }

        function StartTimer(){
        secondval += 1;
        document.getElementById('asass').innerHTML = "-" + secondval;
        if(secondval == 10)
        {
            StopTimer();
            Carousel();
            return;
        }
        if(secondval == 20)
        {
            StopTimer();
            Carousel();
            return;
        }
        runTimer = setTimeout(StartTimer, 1000);
        }

        function StopRun(){
        window.clearTimeout(runCarousel);
        }

        function StopTimer(){
        window.clearTimeout(runTimer);
        }

        function firstStart(){
            setTimeout("Carousel()", 10000);
        }

        firstStart();
    </script>
</body>
</html>
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1 answer

Firstly, an error occurs:

function firstStart(){
     setTimeout("Carousel()", 10000);
}

correctly:

function firstStart(){
     setTimeout(Carousel, 10000);
}

at the end, all default settings are reset and the timer starts:

in the carousel:

if(firstval == 1200){
        document.getElementById('abc-container').style.left = "0" + "px";
        firstval = 0;
        StopRun();
        StartTimer()
        return;
    }

in starttimer

if(secondval == 30) {
        secondval = 0;
        StopTimer();
        Carousel();
        return;
    }

Demo

Here is my example

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