qtranslate set topics with no translate to invisible

Hi, I would like to know how to have a post set invisible if it does not have a translation to go with it. ie:

post A is in English but not in French, if the user is in French mode, it will show “this post is available only in English” I want it to display NOTHING. (for all intensive purposes, the post does not show up in French)

optionally, if the user is in the English document, and SWITCHES to French, it will say “document available in English”