Rotation of Position of Dynamic Data

My site list attorneys. The visitor clicks a link on the home page for a legal practice area. When the listing page appears, it draws from a database and displays a photo and some information about each attorney. The listing page layout has two columns per row. The first listing goes in the left column on the first row; the second goes in the right column on the same row; the third goes in the left column of the second row; and so on. I want the listings to rotate each time the page loads. For instance: If the listing page draws 12 attorneys for the practice area, the first visitor to that practice area listing page will see attorney #1 in the top row, left column. The next visitor will see attorney #2 in the top row, left column, and attorney #1 will appear in the 12th position on row 6, right column. My goal is to allow the attorneys to rotate through the various positions as visitors click on the page.

Please let me know how I can get this done or who may be able to write the code for me.

Thanks.