Instead of: <!--#include virtual="top.html" -->
Try: <!--#include virtual="../top.html" --> because your SSI is not in the same directory folder as your referencing webpages. You might try putting top.html inside a folder called ssi. Then you can use:
<!--#include virtual="ssi/top.html" -->
Instead of:
<!--#include virtual="top.html" -->Try:<!--#include virtual="../top.html" -->because your SSI is not in the same directory folder as your referencing webpages. You might try putting top.html inside a folder called ssi. Then you can use:<!--#include virtual="ssi/top.html" -->