How to install android market app manually? I have device with android 2.1 and I want to install android market app manually. Can I do that? 

I have download android_app.apk file into my device but while installing getting following error. 
Package com.android.market_app requires unavailable shared library com.google.android.datamessaging; failing! 
I tried to search datamessaging.jar file but I can not able to find.
Does I need to do something else.
If you have wi-fi or 3G you can install it through AppBrain Andoid market App

In case if you dont have any network connection you have to find the .pkg (compiled android package) for Android market application, then you need to install it via ADB