I was able to get this to work on my own Q2A site.
I used a different tool-tip plugin.
Here is how i did it.
1. Place a link to Jquery script in your site's footer. I used it hosted at google ajax apis.
2. Place a link to the Jquery tools tool tip plug in in your site's footer. I downloaded a copy of just the tooltips. You can also link it directly from their site if you want the whole thing
position: "top center",
offset: [-8, 0],
}); //end tips
4. Add the following CSS to your site's css file or Q2A theme.
/* simple css-based tooltip */
border:2px solid #225a20;
-moz-box-shadow:0 0 5px #999;
-webkit-box-shadow:0 0 5px #999;
You can customize the css to get the tips to look however you want. And can play with the options of the tooltip plugin for effects, position etc.