Problem with variable scope in javascript

StackOverflow https://stackoverflow.com/questions/4939515

문제

Ok I am definitely puzzled, why this is not returning 6 in textarea. It doesn't return anything. I figured that it has something to do with js scopes, but i cant figure it out.

<body>

    <script language="Javascript">
    var broj = 5;  

    function Inci(){
    var broj++;
    document.frmMain.VrsteHolder.value = broj;
    }

    </script>

    <form name="frmMain" method="get" action="script.php">

    <textarea name="VrsteHolder" rows="4"> </textarea>
    <input type="button" value="Dodaj porudzbinu" name="buttonDodaj" onClick="Inci();"/> 

    </form>

</body>

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