  We define double (central and cocentral) extensions of Manin pairs introduced
by Drinfeld, attached to curves and meromorphic differentials. We define
``infinite twistings'' of these pairs and quantize them in the $sl_{2}$ case,
adapting Drinfeld's ``new realizations'' technique. We study finite dimensional
representations of these algebras in level $0$, and some elliptic examples.
