The top level are the major categories on the left directory of the OSA website in bold.
Other major Categories not listed on the left directory are highlighted on the OSA home page.  Example: Weddings

At this level your banner  is positioned on one of OSA's 36 main index pages.  These index pages contain a reference to articles within the OSA website.
These index pages receive thousands of visitors daily.  At this level your message  reaches the most people possible.
 

The  Second Level of OSA web-pages
 are also listed on the site left index.
These pages are the ones not highlighted. See examples below.
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Home page placement double the standard charge
Get that niche market - per category!

 The Third Level of the OSA website is the content of the Website. This content is the primary reason why our visitor returns. Hundreds and Hundreds 
of Articles of interest.

Your banner on the "sponsors-only", lead-in page to our free listings.
OSA is not your ordinary Local Website

The Fourth Level of the OSA website are reference Pages - Maps / Charts, etc.
Perhaps what we consider to be a sub-level of the OSA website, these pages receive considerable interest due to the content of pages.

Cost-effective web advertising