I was wondering if it's possible at all having a 404 HTML page for when WP has problems or it's down or it's not available. If so, what do I do so that the HTML 404 page is used ONLY when WP is down and not for every instance?
Ex. At the moment I am using Thesis 2.0 and it has its own 404 custom page which is useful for a "not found" page. But let's say that there is a problem with the database or else and WP is not accessible at all (I guess I'm talking about errors 500, 301, etc.). How do I redirect to my own HTML page in that instance?
I am really desperate to find an answer, if there is one.