Javascript/Html question???????????????

[Andy]

I have this code:

<script type="text/javascript">
<!--
function formatText (tag) {
var selectedText = document.selection.createRange().text;

if (selectedText != "") {
var newText = "<" + tag + ">" + selectedText + "</" + tag + ">";
document.selection.createRange().text = newText;
}
}
//-->
</script>

<form name="my_form">
<textarea name="my_textarea"></textarea><br />
<input type="button" value="bold" onclick="formatText ('b');" />
<input type="button" value="italic" onclick="formatText ('i');" />
<input type="button" value="underline" onclick="formatText ('u');" />
</form>

Yes it works, but can you have it so that the tags that appear are hidden?