The most likely reason for your friends not seeing pictures which you have included in the main area of your e-mail is due to one of YOUR e-mail settings having been changed.
From the Outlook Express Help File the following passage explains. “If message recipients are not able to view your inserted images, on the Tools menu, click Options. Click the Send tab, click HTML Settings, and then make sure that ‘Send pictures with messages’ is selected. Then resend your message.”