Email Problem on Guestbook ver. 2.3.1

I have a problem on my guestbook version 2.3.1. Is anyone out there could help me? Greatly appreciative!

The problem is: on the Read message Guestbook, it has a email icon, everytime I click on that icon to send an email it opens several blank windows. If you wanna try click on the Guestbook link of this site, and then click on the email icon you will see.

Thanks in advance,

This is a client problem. The <mailto: someone@domain.com> link opens your *default* email client. If you don't have one, you get this blank window.

Could you show me how to fix the problem? Does it mean that I have to se up in Outlook Express or others an account?

Thank you very much. I fixed the problem. I didn't notice it. I did not happen at home cause I have email setup, but at school I did not that why the problem. Appreciative.