We have implemented a system to allow the users to choose which banner they would like to see in each page.
This will permit the image to be cached, and therefore it saves you bandwidth.
However you can still choose to have a random image in every page, for this to work you just have to select the blank option in the dropdown menu.
You can set your preference
here. Then scroll down and in the
Miscellaneous Options category there is an option named
Forum Banner, there you will find enough information for what you need.
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