Index design

[Steffen Wolfrum <context@st.estfiles.de>]

Hi,

in a index is it possible not to have bold letters as separators  
("a", "w") in a dedicated line, but instead only the first letter of  
the first entry with "a" or "w" bold?

See this minimal example:

\starttext
\chapter{First Chapter}
Some text...\index{word}

\section {First Section}
Some text...\index{word}
Some text...\index{another word}
Some text...\index{another word}

\page[yes]
\completeindex

\stoptext


Here I would like to have only the first letter of the index entries  
"another" and later "word" in the index to be set bold.

(Hope you understand what I mean...)

Thanks,

Steffen