Following the manual I am applying these codes but I am not getting any results.

Code:
BMAP* image1 = "image1.pcx";

if (case)
{pan_setbmap(panel_image,1,1,image1);} //change image

MATERIAL* skin1 = "skin1.tga";

if (case)
{ent_mtlset(my,skin1,1);} //change material


Should these codes not work?