JavaScript pass back to form

I got a form in HTML and I use Javascript to listen on click on button and data are transferred to applet to calculate and pass back.
How can I pass this value back to the textarea of the form immediately to display ?

Try this out....
<HTML>
change it
<form name="myform">
<textarea name="myTextArea">initial text</textarea>
</form>
</HTML>
<script>
function a()
window.myform.myTextArea.value='changed text';
</script>
Hope this helps
Regards
Omer

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JavaScript pass back to form

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