  We reformurate a central extension of Felder's elliptic quantum group in the
FRST formulation as a topological algebra E_{q,p}(gl_N) over the ring of formal
power series in p. We then discuss the isomorphism between E_{q,p}(gl_N) and
the elliptic algebra U_{q,p}(gl_N) of the Drinfeld realization. An evaluation
H-algebra homomorphism from U_{q,p}(gl_N) to a dynamical extension of the
quantum affine algebra U_q(gl_N) resolves the problem into the one discussed by
Ding and Frenkel in the trigonometric case. We also provide some useful
formulas for the elliptic quantum determinants.
