<script type="text/javascript">
    function setCH(){
    var frm=document.TabFrm;
    var target = document.myfrm;
    if (frm.CH!=null){
    if (frm.CH.length> 1 ){
        for (var i= 0 ; i <= frm.CH.length; i++)
          {
         if (frm.CH[i].checked) target.CH.value = frm.CH[i].value;		
          }
    }else{
        if (frm.CH.checked) target.CH.value = frm.CH.value;		
    }
    }  
    }
</script>

<form name='TabFrm'>
<input type="radio" name="CH" value="1" onclick="setCH();"/>
<input type="radio" name="CH" value="2" onclick="setCH();"/>
<input type="radio" name="CH" value="3" onclick="setCH();"/>
</form>

<form name='myfrm'>
 <input type='text' name='CH' value=''>
</form>

<script type="text/javascript">
function setCH(obj)
{
	document.getElementById('myText').value = obj.value;
}
</script>

<form name='TabFrm'>
<input type="radio" name="CH" value="1" onclick="setCH(this);"/>
<input type="radio" name="CH" value="2" onclick="setCH(this);"/>
<input type="radio" name="CH" value="3" onclick="setCH(this);"/>
<input type='text' id='myText' name='CH' value=''>
</form>