Untitled

<html>
<body>
<p id="text"> Lorem ipsum dolor sit amet. </p>
</body>
<script>
    document.onkeydown = KeyCheck;  //or however you are calling your method
    function KeyCheck()
    {
        var KeyID = event.keyCode;
        switch(KeyID) {
            case 8:
            var textbox = document.getElementById("text");
            var value = textbox.innerHTML;
            textbox.innerHTML = value.substring(0, value.length - 1);
            break;
            default:
            break;
   }
}
</script>
</html>