/* initialize parameters for the window margin dialog */
_initmgv()
{
        setvar("_lmgauto", castint(getwmargin(1, 1) == 0));
        setvar("_rmgauto", castint(getwmargin(2, 1) == 0));
        setvar("_tmgauto", castint(getwmargin(3, 1) == 0));
        setvar("_bmgauto", castint(getwmargin(4, 1) == 0));

        if (getvar("_lmgauto")) setvar("_lmgpc", "-1");
        else setvar("_lmgpc", caststring(round(getwmargin(1))));
        setvar("_lmgpval", caststring(round(getwmargin(1))));

        if (getvar("_rmgauto")) setvar("_rmgpc", "-1");
        else setvar("_rmgpc", caststring(round(getwmargin(2))));
        setvar("_rmgpval", caststring(round(getwmargin(2))));

        if (getvar("_tmgauto")) setvar("_tmgpc", "-1");
        else setvar("_tmgpc", caststring(round(getwmargin(3))));
        setvar("_tmgpval", caststring(round(getwmargin(3))));

        if (getvar("_bmgauto")) setvar("_bmgpc", "-1");
        else setvar("_bmgpc", caststring(round(getwmargin(4))));
        setvar("_bmgpval", caststring(round(getwmargin(4))));

}