  We extend the ideas of Friedman and Qin (Flips of moduli spaces and
transition formulae for Donaldson polynomial invariants of rational surfaces)
to find the wall-crossing formulae for the Donaldson invariants of algebraic
surfaces with geometrical genus zero, positive irregularity and anticanonical
divisor effective, for any wall $\zeta$ with $l_{\zeta}=(\zeta\sp{2}-p_1)/4$
being zero or one.
