How do you post them that large? What method did you use to post them?
PHP Code: 
[IMG]http://domainname.com/imagepath/image.gif[/IMG] 
Vbulletin has its own tags. So instead of using html tags, you can just use vbulletin tags.

1. upload pictures to your gallery.
2. right click on the picture and select "Copy Image Location". I use Firefox.
If you use m$ then select "properties", you see a URL of your picture. Copy it.
3. <-- Click on this button You should have a standard editor enabled.
4. Paste the URL of your picture. That's all..

This way you can display a picture which does not exist on this website.
From Yahoo.com

9 more days till harvest, eh? I can't wait to see your harvest.. When I see other's harvest pics, I get exciting.. I don't know why..