Change the directory name of install

[Reeve of shinra]

You will need to go into your admincp (by default this would be yoursite.com/forum/admincp/index.php)

Expand Styles & Templates on the left side.
Click on Style Manager

All of your styles will show up on the right window. Click on teh drop down box and choose "stylevars"

Look through that and edit the path to your images.

If you edit a parent style, child styles will inherit the change unless you manually changed them.