bitmap cross="crosshair.tga";

panel cross_pos{
bmap=cross;
flags=visible, transparent, d3d;
}

function set_cross_pos{ //an geeigneter stelle callen
cross_pos.pos_x = (screen_size.x - bmap_width(cross))/2;
cross_pos.pos_y = (screen_size.y - bmap_height(cross))/2
}

PS: steht im manual.