Outlook 2003 signature issues

I am having problems with outlook 2003 signature when replying to emails. I have set the font on my signature for replying to mails to Tahoma. I am using HTML to compose the message. I have also made sure that on the stationery tab I have the Tahoma font set as my default. However when i reply to any(including mails composed with HTML) mail i still get my signature font changed to times new roman. This only happens when I am replying to mail not when I am composing new mails. Can someone please inform me how I can solve this problem?