NETWORKING /etc/resolv.conf/ Ubuntu 10.0.4

[zongo saiba]

Hi, 

Could anyone tell me why my /etc/resolv.conf/ file gets emptied and then
I lose all connections to my wireless network ? I mean, I have figured
out why this was happening. I have to manually reconfigure manually
resolv.conf everytime this happens and all his back to normal. 

resolv.conf is controlled by NetworkManager. Should I configure
NetworkManager in any particular way ? Or May by my routeur ? 

Kind Regards, 

zongo