I to have integrated graphics. if you can upgrade your ram to a bigger stick AND a faster speed of ram you should notice some better fps.
ex: i had (1) 256 stick pc2400 in slot 1 and empty slot 2
>>newegg.com and credit card later...<
512 stick pc2700 in slot 1 old 256 stick in slot 2
Boot up wolfenstein enemy territory load a map more than 20 more fps average :)
BUT i would get a geforce 7800 gtx nowadays ;O and 4 gigs of ram. then you'll have noo worries except what to do with 4 gigs of ram. lol