(help) Animated floor/ceiling in Wolf 3D SDL

Hi members! I like to add Animated floor/ceiling to Wolf 3D SDL and don't work. What is problem?

WL_FLOORCEILING.CPP:

Code:

                if(curtex)
                {
                    unsigned curtoptex = curtex >> 8;
                    if(curtoptex > 0 && curtoptex < 64) curtoptex += 255;  //Note: change the 64 to match your last wall texture
                    if (curtoptex==250) // Whatever your wall ID is
                        curtoptex+= (frameon>>4)&4;
                    if (curtoptex != lasttoptex)
                    {
                        lasttoptex = curtoptex;
                        toptex = PM_GetTexture(curtoptex);
                    }
                    unsigned curbottex = curtex & 0xff;             
                    if(curbottex > 0 && curbottex < 64) curbottex += 255; //Note: change the 64 to match your last wall texture
                    if (curbottex==250) // Whatever your wall ID is
                        curbottex+= (frameon>>4)&4;
                    if (curbottex != lastbottex)   
                    {
                        lastbottex = curbottex;
                        bottex = PM_GetTexture(curbottex);
                    }

250-253:Animated water