Before
After

• Add the following CSS to make the tooltip style match your site.

<style type="text/css">
#tooltip {
 width:250px;
 background:#222222 url();
 color:#dddddd;
 border:#444444 2px solid;
 padding:5px;
}
</style>

• Don't add this to the Custom CSS because it will get overridden unless you add a !important after each definition... it's best to add all of the above CSS to the Banner or Footer HTML (Control Panel > Custom Code > Banner HTML or Footer HTML)
  

• Customizing
  

• Tooltip Width: Change the tooltip width by modifying the width (in red)
  
  width:250px;
  
  
• Background: Change the tooltip background color (in blue) or add a background image URL inside the parentheses.
  
  background:#222222 url(BACKGROUND IMAGE URL HERE) ;
  
  
• Font Color: Change the font color (in blue)
  
  color:#dddddd;
  
  
• Border: Change the border color (in blue), thickness (in red) or style (in green)
  
  border:#444444 2px solid;
  
  
• Padding: Change the spacing between the border and the text (in red)
  
  padding:5px;
  

• Adding content to the tooltip as follows:
  
  
  1. Add a class called "tooltip" to any link to tell the script that this will have a tooltip window (in green)
     
     
  2. Add your tooltip content to the title attribute of the link (in blue)
     
  
  Example: <a class="tooltip" href="LINK URL" title="This will be inside the tooltip">Hover for Tooltip</a>
  
  Example in action: Hover for Tooltip
  
  
• Quotes: Don't add any quotes inside the tooltip, if you want to add quotes, use the HTML code for it: &quot;
  
  Example: <a class="tooltip" href="LINK URL" title="Replace &quot;quotes&quot; like this">Hover for Tooltip</a>
   
  The tooltip content will show this: Replace "quotes" like this
  
  
• Images: You can also add images into the tooltip, use single quotes around the image source URL.
  
  Example: <a class="tooltip" href="LINK URL" title="This makes me Happy! <img src='http://i201.photobucket.com/albums/aa236/Mottie1/testsite/emotes/tongue.gif'>">Hover for Tooltip</a>