Hey all i am trying to jaibreak my iphone 3g using resnow, but it is asking to find the corresponding Ipsw for the my current firmware. i dont no where to find this on my computer could sum 1 please direct me to the right spot thanks

You won´t find it on your computer if you haven´t downloaded it. If you did download it only you know where to... If you didn´t, look here:

iClarified - iPhone - How to Select an iPhone Unlock/Jailbreak Tutorial

for your tutorial (you posted in the 2G section but seem to have a 3G phone thats why i don´t know what is right for you) - in the tutorial are links where to download all necessary files from! good luck!