"keyboard" og felt der har focus + evt. backspace

Jeg er ved at lave et "keyboard"
Hvordan får jeg den til at skrive i det felt der har focus.

(Det er kun 1 + 2 + space der virker indtil videre.)

Er det muligt at lave en backspace også ?

Det skal bruges på en Pocket PC 2003

Stoney

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script language="JavaScript" type="text/JavaScript">

function addchr (chr){
document.form1.textfield.value = document.form1.textfield.value + chr;
}



</script>

<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
<!--
.keyb {
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 11px;
    text-align: center;
    text-decoration: none;
}
-->
</style>
</head>

<body>
<form name="form1" method="post" action="">
  <input type="text" name="textfield">
  <br>
  <input type="text" name="textfield2">
</form>
<table width="250" border="0" cellspacing="0" class="keyb">
  <tr>
    <td width="75"><a href="#" onClick=addchr('1')>1</a></td>
    <td width="75"><a href="#" onClick=addchr('2')>2</a></td>
    <td width="75">3</td>
    <td width="75">4</td>
    <td width="77">5</td>
    <td width="77">6</td>
    <td width="77">7</td>
    <td width="77">8</td>
    <td width="77">9</td>
    <td width="77">0</td>
    <td width="77">(</td>
    <td width="77">)</td>
  </tr>
  <tr>
    <td>Q</td>
    <td>W</td>
    <td>E</td>
    <td>R</td>
    <td>T</td>
    <td>Y</td>
    <td>U</td>
    <td>I</td>
    <td>O</td>
    <td>P</td>
    <td>&Aring;</td>
    <td>*</td>
  </tr>
  <tr>
    <td>A</td>
    <td>S</td>
    <td>D</td>
    <td>F</td>
    <td>G</td>
    <td>H</td>
    <td>J</td>
    <td>K</td>
    <td>L</td>
    <td>&AElig;</td>
    <td>&Oslash;</td>
    <td>+</td>
  </tr>
  <tr>
    <td>Z</td>
    <td>X</td>
    <td>C</td>
    <td>V</td>
    <td>B</td>
    <td>N</td>
    <td>M</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td>&lt;</td>
    <td>&gt;</td>
    <td>\</td>
    <td>/</td>
    <td>=</td>
    <td bgcolor="#CCCCCC" onClick="addchr(' ')"><a href="#" onClick=addchr(' ')><font color="#CCCCCC">'
      '</font></a></td>
    <td bgcolor="#CCCCCC" onClick="addchr(' ')"><a href="#" onClick=addchr(' ')><font color="#CCCCCC">'
      '</font></a></td>
    <td>;</td>
    <td>,</td>
    <td>:</td>
    <td>.</td>
    <td>-</td>
  </tr>
</table>
<p>&nbsp;</p>
</body>
</html>