List Retrieval and Display on Click (maybe hover, too)

List Retrieval and Display on Click (maybe hover, too)

I'm new to jQuery. Not sure if this belongs here or in jQuery UI....
 
I have a table with checkboxes (with short text). Each checkbox needs more information for the user if they want it (either hover or click the text -- haven't decide which or both?).  However, I don't want to download all the extra text if they don't need it.
 
So, How might I go about detecting the hover or click and then asking the server for some more HTML that I could then display until the user mouses-out?
 
Thanks,
Owen