[tbworld]

This is done by adding text to the "title" attribute of the element in which you want the tooltip to appear.

For example on "your" postbit template:

  / * Elongated for clarity -- Not actual code as the  "// comment" is not HTM, and should be removed */
  <span 
     title  = "Administrator"    // Add the text "Administrator" as tool-tip
     style = "color:#FF0000;"> 
        <b>Elixir</b>
  </span>

In reality you will wish to use a template variable to report information via a tooltip.

See ... for reference:
http://www.w3schools.com/tags/att_global_title.asp