[plt-scheme] annoying cookies and doc search box

The search box has started leaving cookies in the browser, which is 
*extremely* annoying when searching the docs in local installation with 
firefox 3.

Specifically, when the browser option for asking before setting cookies is 
enabled the damn thing will keep asking every time (even when you accept 
the first time and ask it to stop asking!), presumably because there is no 
site. The cookie disalog is presented as "the site file:// wants to set a 
cookie blah blah blah".

I don't know whether this is a bug in firefox or a bug in the 
generated docs, but why is the search box setting cookies in the first 
place? At the very least, when browsing locally from the file system it 
should not.

firefox 3.0.3, GNU, plt-4.1.2.5 if you want to reproduce

-- vyzo