you aren't sending the images - they are still on your hard drive. When you create a page in FrontPage (or any other web design application) and place images on the page, the images are not included with the page file. They are simply referenced in the placeholders, and are uploaded to the server in an images folder when you first publish the site. Each time a visitor calls a page by clicking on one of the site's navigation buttons the server gets the images from the folder and places them into the page for that person's browser to download.
If you want to send a page to friends you must save it as an HTML file (select that file type from the File/save as menu option), although you should be aware that any special FrontPage elements - such as hover buttons - will not be visible when the recipient opens the page in his/her browser. They are also a server-side element, and will not save with the page file.