e1a3a9e2_eb_Design_Blog_Web_Design_Blog__Example_
[Type:] Zoom [Important:] This might not be very useful for a whole site unless it is very specialized. However as part of a site, a gallery, news-snippets or similar, it can be practically indispensible. [Example:] 
Zoom, or Spatial structure is a way to let the visitor dive deeper to get more detailed information of a subject. Thumbnail pictures that are linked to a fullsize image is one example, a linked word in text that leads to deeper information is another, a multilevel DHTML-menu is yet another. This is very common on the web.
What's behind the great designs? - Web Design Blog Web Design Blog
Example: