  We consider the production and two-photon decay of the $CP$-even Higgs bosons
($h^0$ and $H^0$) of the Minimal Supersymmetric Standard Model (MSSM) at the
Large Hadron Collider. We study in detail the dependence of the cross section
on various parameters of the MSSM, especially the dependence on the mixing
effects in the squark sector due to the Higgs bilinear parameter $\mu$ and the
soft supersymmetry breaking parameter $A$. We find that the cross section for
the production of these Higgs bosons has a significant dependence on the
parameters which determine the chiral mixing in the squark sector. The cross
section times the two-photon branching ratio of $h^0$ is of the order of
15--25~fb in much of the parameter space that remains after imposing the
present experimental constraints. For the $H^0$ the two-photon branching ratio
is only significant if the $H^0$ is light, but then the cross section times the
branching ratio may exceed 200~fb. The QCD corrections due to quark loop
contributions are known to increase the cross section by 50\%. We find the
dependence of the cross section on the gluon distribution function used to be
rather insignificant.
