I'm writing a simple virtual keyboard for Arabic (indic) digits. Just links that, when clicked, produce the corresponding Unicode Indic character.

The following is my HTML, in the body tag:

<a href="#" id='start'>Start</a> 
<div id='vkb' style='padding:20px;font-size:16pt; border:2px solid #eee; width:250px' dir='ltr'>
<a class='key' href='#' id='0'>&#1632;</a> 
<a class='key' href='#' id='1'>&#1633;</a> 
<a class='key' href='#' id='2'>&#1634;</a>  
<a class='key' href='#' id='3'>&#1635;</a>  
<a class='key' href='#' id='4'>&#1636;</a><br />
<a class='key' href='#' id='5'>&#1637;</a>
<a class='key' href='#' id='6'>&#1638;</a>
<a class='key' href='#' id='7'>&#1639;</a>
<a class='key' href='#' id='8'>&#1640;</a>
<a class='key' href='#' id='9'>&#1641;</a>
<br />
<a href="#" id='stop'>Stop</a>
</div>
<div id='output' /></div>

This is my CSS:

a
{
    text-decoration:none;
}
.key
{
    padding:7px;
    background-color:#fff;
    margin:5px;
    border:2px solid #eee;
    display:inline-block;
}
.key:hover
{
    background-color:#eee;
}

And this is my javascript:

<script type="text/javascript" src="js/jquery.js"></script>
<script>

    $(document).ready(function(){
var toprint = "";

    $('#vkb').hide();
    $('#start').click(function(e){
        toprint = "";
        $('#vkb').show();
    });

    $('#stop').click(function(e){
        $('#vkb').hide();
        ret = ar2ind(toprint);
        $('#output').text(ret);
        toprint = "";
    });

    $('#vkb').click(function(e){    
        var $key = $(e.target).closest('.key');
        var pressed = $key.attr('id');
        if(pressed === undefined){
        pressed = "";
        }
        toprint = toprint + pressed;
    });
});
        function ar2ind(str)
        {   str = str.replace(/0/g, "?");
            str = str.replace(/1/g, "?");
            str = str.replace(/2/g, "?");
            str = str.replace(/3/g, "?");
            str = str.replace(/4/g, "?");
            str = str.replace(/5/g, "?");
            str = str.replace(/6/g, "?");
            str = str.replace(/7/g, "?");
            str = str.replace(/8/g, "?");
            str = str.replace(/9/g, "?");
            return str;
        }
</script>

It seems simple enough but it's crashing in IE9. (Might be crashing in earlier versions too but haven't been able to check.)