Change this line

objCDO.TextBody = strBody

to

objCDO.HTMLBody = strBody

You'll need to construct the HTML body though.

PS.  I really don't recommend you put up this script as is because there are many spammer who will use your "Tell a friend" page to send spam.  If you really want to have a tell a friend page, I recommend you put some capchat validation.  See http://en.wikipedia.org/wiki/Captcha

These forums are for ASP.NET, not classic ASP.  You could try your question on the Classic ASP Forum at Forums.IIS.NET, or the ASP Messageboard, Microsoft's ASP newsgroup (microsoft.public.inetserver.asp.general), or another community which deals with Classic ASP.

Note that the membership is shared between ASP.NET and IIS.net, so you can use the same login credentials across both sites.