How to Check if Someone is Invisible or offline in GTalk

Google has implemented the feature of being invisible in the gmail chat, google talk gadget and  google talk for Iphone , Now if you ever want to know that someone is really offline or has just gone invisible then here is a small trick .

1. Open GTalk and click on person you want to confirm as offline or invisible .
2. Now just type in any message to him/her
3. If GTalk says that " xxx@gmail.com is offline and cannot recieve your messages right now " , then that person is really offline , else that person has gone to invisible mode .

Now if he/she is online but invisible you will get a window like this .So , Next time do not let anyone fool you , rather catch him Invisibly .