Calendar Plugin

Has anyone successfully changed this plugin to add a start time and an end time instead of just having the time posted?

Also the optional Url you can enter.. Would make a lot more sense if this was hard-coded and lead to a details page for that listing.

Also I have had one hell of a time finding the css that handles the mouseover box. Can anyone tell me? I just want to add a border and change the bg color.. I have already changed it so it does not show the color of the event category.. instead the background color is white but I can not seem to find where to add the border. Any help is greatly appreciated.