  Drinfeld gave a current realization of the quantum affine algebras as a Hopf
algebra with a simple comultiplication for the quantum current operators. In
this paper, we will present a generalization of such a realization of quantum
Hopf algebras. As a special case, we will choose the structure functions for
this algebra to be elliptic functions to derive certain elliptic quantum groups
as a Hopf algebra, which degenerates into quantum affine algebras if we take
certain degeneration of the structure functions.
