Could you help me remember that songs name?

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Lol, well the tittle say what this is about. ^.^ I want to download trough Limewire a sond that i hear on the radio some hrs ago. It's not a modern song. Its a classic. Its in english. Its chorus says at some point "baby dont leave me, dont leave me, who oh" as fas as i remember. The genre is.. like soft rock. It is on a commedy movie about tho brothers. One is a big one (the dumb one) and the other is a short one (teh clever one). They both get along, then fight, get a chick, and at the end they become friends again. I want to download that song but i cant rememebr its name ^.^ Any suggestion would be gratefully apreciated. :P Thx