<script language="javascript" type="text/javascript">
function addtext() {
var newtext = document.myform.inputtext.value;
document.myform.outputtext.value = "";
document.myform.outputtext.value += newtext;
}
</script>
<form name="myform">
<table border="0" cellspacing="0" cellpadding="5"><tr>
<td><textarea style="width:300px; height:200px;" name="inputtext">


111111111111


</textarea>


</td>
<td><p><input type="radio" name="placement" value="replace">Replace Existing Text<br>
<input type="button" value="Add New Text" onClick="addtext();"></p>
</td>
<td><textarea style="width:300px; height:200px;" name="outputtext">


22222222222222222


</textarea></td>
</tr></table>
</form>