Strict Standards: Declaration of ContentModelCategories::populateState() should be compatible with JModelList::populateState($ordering = NULL, $direction = NULL) in /home/lazermak/public_html/components/com_content/models/categories.php on line 19
These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).
This shows you how to make a simple image gallery using articles in com_content.
In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.