Funny thing is, I loaded Norton 2004 and didn't have to change a thing. I have never been restricted from any of the sites I surf. I wonder why anyone would have an image loading problem just because they use Norton FW.
I maintain a hobby-related website, and I have seen Norton 2003 removing content from my own site when viewing it on my computer. I can't say whether the 2004 version does this since I don't have it (and never will).
I learned that this can be avoided by carefully choosing wording and file names. For example, I saw a file named ad_1.jpg removed by Norton (and it would not even give you a red "X" to show you that something was missing). I renamed the file to ad1.jpg and, lo and behold, there it was. These files are relevant to the content of the site (they are actually scans of vintage print advertisements).
Regardless of whether Norton can be configured to disable this interference with legitimate site content, site users might have this problem without even knowing it is happening. Site operators who are not aware of this issue might just be losing money in the form of lost business.