on = 0;
if (x > global.idealborder[0] && x < global.idealborder[1])
    on = 1;
if (y >= (obj_dborder.y - 20) && y < obj_dborder.y && on == 1)
{
    bomb = instance_create(x, y, obj_incendiary);
    if (instance_exists(bomb))
    {
        bomb.number = 1;
        bomb.hspeed = hspeed;
        bomb.dmg = dmg;
    }
    instance_destroy();
}