using javascript to count chars in a textarew is not working in firefox !! why?

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Javascript

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Firefox

hello im trying to count chars ans words and determine if its heb or eng in a regular textarea control, usig javascript, but none of this works in firefox, can someone please help me?

my code :

<script type="text/javascript">

    function langChk()
    {
        var str = new String(document.smsform.txt2.innerText.toString());
        var i = 0;
        var cnt = str.length;
        if(cnt == 0)
        {
            document.all('msgCounter').innerHTML = "0"
            document.all('chrCounter').innerHTML = "0"
        }

        for(i=0 ; i < cnt ; i++) // will not start unless cnt > 0
        {
            var ch = parseInt(str.charCodeAt(i));

            if(ch >= 1488 && ch <=1514) //chk 4 heb
            {
                counter(1,cnt);
                break;
            }
            else
                counter(2,cnt);
        }
    }

    function counter(method,cnt)    //accepts lang method and calc num of msgs
    {

        switch(method)
        {
            case 1 :
                if(cnt > 0 && cnt <= 70)
                    document.all('msgCounter').innerHTML = "1";
                if(cnt > 70 && cnt <= 134)
                    document.all('msgCounter').innerHTML = "2";
                if(cnt > 134 && cnt <= 201

</script>

can anyone point on a problem here guys ?? (i know the code block is cut in the middle, ok)
noam