Hi!

var ciel_pos = 0 ; //must be declared before use
//
KEY_CUL should be key_cul ...Lite-C is case sensitive
//
// you have defined ciel_pcx as a bmap in a panel
// you then have to use the panel name ...not the bmap
// so ciel_pcx.pos_x is ciel_pan.pos_x

edit
also
bmap mont_map;
should be bmap = mont_map; //in 2 places
and you have to declare this bmap at the top
BMAP* mont_map = " "; //use your picture pcx