HTC Desire :: App To Turn Off The Internet?

I have an app that allows me to turn off/on my bluetooth and wifi with one click but can't seem to find one that turns off the GPRS data connection.

I've gone into turn off the Background data but i still get the arrow pointing away from the phone at the top under the "H" symbol showing that data is still being transmitted intermittently. I have set my facebook, email and weather etc to update manually.

the only way that i can stop the arrows under the H from flashing (i presume thats the gprs transfering data) is to have my wifi on then the "H" goes away. But I am trying to conserve battery so i would like to have wifi, bt and gprs off until i need it.