[pmwiki-users] making http:// not a link

[Ben Stallings]

I'm working on a form where I want people to enter a URL without the 
http:// at the beginning, and I'd like to indicate this by having the 
characters http:// appear before the entry blank.  Is there a clever way 
to prevent the http:// from being turned into a Link To Nowhere?  I 
don't want to disable the http markup for the whole site.

Possibly a separate question: should the markup responsible for http:// 
links be made smart enough to recognize when the resulting URL could not 
possibly be valid, because, for example, there's nothing there?

Thanks in advance!  --Ben S.