Can subject in mail function be set in charset=big5?

I have sent an email using mail function in which the subject and email body have charset=big5 and they are generated by mysql statement. Customers with outlook express can read the big5 chinese characters without any trouble. However, people who read their emails from Lotus Notes complain that they cannot read the subject. But, they can read the email body because I have put $mailHeader="From: blah@blah.com\r\nContent-type: text/plain; charset=big5\r\n" ; My mail statement looks like mail($mailTo, $mailSubject, $mailBody, $mailHeader) ; where $mailSubject and $mailHeader are both big5 char. Is there a way I can set $mailSubject charset=big5? Thanks for your help Ellen __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com