ASP.NET: What do I do, when the customError page gives an error?

[amish_irish]

I have the following customErrors section in my ASP.NET application:\[code\]<customErrors mode="RemoteOnly"> <error statusCode="500" redirect="500.aspx"/></customErrors>\[/code\]How do I show user-friendly message, if "500.aspx" gives an error (it could happen when the database is down, for example)?