|:bgimage.answer:, :bgimage.main:||The name of the background image for your main FAQ page and answer pages that you specified in the Settings dialog box|
See the default templates supplied with Friday; these use both of these placeholders.
How/When you'd use it
Friday's default templates use these placeholders to specify background images for main and answer pages, so all you need to do to set a new background image for all of your HTML pages is to specify a new background image file in Settings and re-generate your HTML pages.
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Friday The Automatic FAQ Maker