layout config

I'm trying to get the calendar to look pretty similar to a previous calendar I had built, but I'm haveing trouble finding where alot of the layout things are printed. I'd like to remove the year from above the calendar, I'd like to change the next and previous months to a graphic. I'd like to edit the apearance of the event pop up window (maybe put in different graphics, depending on what catagory the event is...). Can someone tell me where in the code I can change these things?

hint:
file: ltw_classes.php
class: ltw_calendar
function: display