Installing a Zip file onto android device

[#1]

Please can someone advise me how to manually install an app to Android that is a Zip file?
There is no .APK in the file.
It is the FON App
Thanks
NE

[#2]

A quick google comes up with this hit......
http://androidforums.com/android-lounge/479675-installation-applications-in-zip-format.html
I've not tried it myself

[#3]

Thanks
It worked - I mustn't have put the right context into Google search 
NE