code for room transitions

draw_set_alpha(1)
if (room == rm_furnace) {
    draw_sprite(spr_furnace_gointo, sprite_num, 0, 0);
}

if (room == rm_office &&room_previous ==rm_furnace ) {
    draw_sprite(spr_furnace_gooutoff, sprite_num, 0, 0);
}
if (room == rm_sewage) {
    draw_sprite(spr_sewage_gointo, sprite_num, 0, 0);

}
if(room==rm_office&&room_previous ==rm_sewage) {
    draw_sprite(spr_sewage_gooutof,sprite_num,0,0);
}