How do i to put bold into a form?

Hey

How do i to bold tags into a text form?

for example i have this form:

[CODE]
<form>
<input type=’button’ value=’b’ class=’button’ style=’font-weight:bold;width:25px’>
<br />
<br />
<TEXTAREA rows=”40″ cols=”40″></TEXTAREA>
</form>
[/CODE]

How do i get the code to put in <b></b> tags in the text area?

Hope someone can help

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