+void setElementChangePages(struct ElementInfo *ei, int change_pages)
+{
+ int change_page_size = sizeof(struct ElementChangeInfo);
+
+ ei->num_change_pages = MAX(1, change_pages);
+
+ ei->change_page =
+ checked_realloc(ei->change_page, ei->num_change_pages * change_page_size);
+
+ if (ei->current_change_page >= ei->num_change_pages)
+ ei->current_change_page = ei->num_change_pages - 1;
+
+ ei->change = &ei->change_page[ei->current_change_page];
+}
+
+void setElementChangeInfoToDefaults(struct ElementChangeInfo *change)
+{
+ int x, y;
+
+ change->can_change = FALSE;
+
+ change->events = CE_BITMASK_DEFAULT;
+ change->target_element = EL_EMPTY_SPACE;
+
+ change->delay_fixed = 0;
+ change->delay_random = 0;
+ change->delay_frames = -1; /* later set to reliable default value */
+
+ change->trigger_element = EL_EMPTY_SPACE;
+
+ change->explode = FALSE;
+ change->use_content = FALSE;
+ change->only_complete = FALSE;
+ change->use_random_change = FALSE;
+ change->random = 0;
+ change->power = CP_NON_DESTRUCTIVE;
+
+ for(x=0; x<3; x++)
+ for(y=0; y<3; y++)
+ change->content[x][y] = EL_EMPTY_SPACE;
+
+ change->player_action = 0;
+ change->collide_action = 0;
+ change->other_action = 0;
+
+ change->pre_change_function = NULL;
+ change->change_function = NULL;
+ change->post_change_function = NULL;
+}
+
+static void setLevelInfoToDefaults(struct LevelInfo *level)