change textarea content

[web_server]

Hi,
I have a a simple form with textarea field and a combobox . I bring the data in both (textarea field + combobox) from the database
I want that when the user chooses one of the combobox options the textarea field changes with it .
any ideas?
thank you .

[RonPK]

<form>
<select onchange="this.form.textareaName.value=this.value">
<option>foo</option>
<option>bar</option>
</select>
<textarea name="textareaName"></textarea>
</form>