char *new_text = gtk_combo_box_get_active_text(GTK_COMBO_BOX(divemaster));
old_text = dive->divemaster;
dive->divemaster = new_text;
char *new_text = gtk_combo_box_get_active_text(GTK_COMBO_BOX(divemaster));
old_text = dive->divemaster;
dive->divemaster = new_text;