Reasons for such a problem are:

• Images are under wrong directory or incorrect paths have been specified. To solve this check the source code for your page and see where the images should be;
• The hotlink protection is in conflict with the Frontpage settings. To solve this log in your Cpanel and go to Hot Link Protection and disable it.

If the above does not help, log in your Cpanel and go to the Error log. You will find the exact problem there.