I got Powertech Power Inverter as Deeno recommended from Jaycar for $49 and cig lighter socket (female) with battery clamps for $10 dollars. I spoke to the guy at Jaycar and he thinks this is the best solution cos of the size of the plug that goes to the laptop. Its really very small! And the one that Robin recommended didnt have that in the kit. So buying adopter wasn't an option cos you can't buy just that size but whole bunch of them for around $24 dollars.
My Asus laptop Eee PC specs on the charger are 19V 2.1 A.
I hooked everything and its been running everything I need for the last few hours and still going OK so I am happy
As it usually happens I need that tonight so ordering on line wasn't an option.
Thanks everyone!
cheers
bob