Combine two fields using java/ajax BEFORE form submission

Rating8.2Very Good

OK So I have a pretty simple form that goes something like what you see below.

What I want to do is to add something to the field "email_body"

so basically it adds "{wishlink_do_not_delete_it}" to the end of text that the user types in

so that the final result that gets submitted as email_body is:
USER INPUT HERE BLAH BLAH
{wishlink_do_not_delete_it}

I know this can be done with java.. does anyone know how?

Thanks in advance

<form method="post" action="index.php?" >
		<textarea rows="7" cols="40" name="email_body" class="inputbox" style="width: 255px;">
USER INPUT HERE BLAH BLAH	
		</textarea><br/><br/>
		<?php echo JText::_('INVITE_BY_EA') ?><br />
		<input type="text" name="invite_by_ea" size="26" class="inputbox" style="width: 255px;" /><br /><input type="submit" value="<?php echo JText::_('BTN_INVITE') ?>" title="<?php echo JText::_('TITLE_EMAIL_EA') ?>" class="addtocart_button" style="margin-top: 8px" />
	</form>

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Solution Grade: A