Searching Within A Textbox?

<script type='text/javascript'>

function highlight()
{
var find = document.BODY.term.value;
var text = document.BODY.body.createTextRange();
var mark = text.getBookmark();

if(!find)
{
alert('You must enter a search term');
return false;}

text.findText(find);
alert(text.moveToBookmark(mark));}

</script>

<form name='BODY'>
<input type='text' name='term' /><input type='button' value='Find' onclick='highlight();' />
<br />
<textarea name='body'>hello there, hello!</textarea>
</form>

Basically, what I would like this to do is simply search for a string within the textarea and highlight it. So far all it does is return true or false on success ( concerning findText AND moveToBookmark ).