Please can you help

I have a some code which uses a textarea comment box that will on post return the users text to the same page that they entered it on. However I wanted it to be able to check for a existing comment and create a new line rather than replacing it. Here is the code:

<html>
<head>
<script type="text/javascript">
function showComment(){ var data=document.getElementById("text").value;
     alert(data);
     document.getElementById("comment").style.visibility= "visible";
     document.getElementById("lab").innerHTML=data;
     }

</script>
</head>
<body>Post Comment: <br><textarea id="text" rows="10" cols="40"></textarea><br>
<label id="comment" style="visibility:hidden"><b>Comments: </b>
</label>
<label id="lab"></label><br>
<input type="button" value="Post" onclick="showComment();">
</body>
</html>

Please could you change the code so it will do this Please. Many thanks.

Colin.

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