Your images load fine in IE and Mozilla for me
I can tell you that you have another error.
You did not specify your vb3 table prefix when installing Photopost or entered the wrong database information.
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/virtual/site2/fst/var/www/html/gallery3s/forums/vb3.php on line 25
So you will not be able to login so you need to specify the proper database information to connect to the forum in the config-inc.php and if this information is connect then you need to edit the settings table of the gallery in phpmyadmin and setting 83 of that table specify the proper table prefix for the forum
This may also mean that your vb3 usergroups did not get copied as well so you may need to add in your usergroups table an insert for administrator with a groupid of 6 and cpaccess set to 1 to get an admin link when signed in