You might like to trash Safari preferences and reset it. If no deal, remove it and reinstall. Does this happen on another account? To learn this, create a new account in system preferences, allow it to administer the computer, log into it and try. If this happens again, it is a system-wide issue, if not, just your main account. Then some maintenance is in order, like TinkerTool or the likes. Otherwise, if you have no special reason to use Safari, switch to Camino or Firefox altogether. Tell us how it goes.
Recently, Safari 3.2.3 on 10.4.11 has stopped loading images. No placeholder icons appear, just blank spaces. Other browsers, such as Firefox, are not affected, nor are other user accounts. I tried repairing permissions, but that didn't help. Has anybody ever seen this behavior? Is this something that a preferences reset should be able to resolve, or is something more drastic necessary?