The format for linking to an event is:
http://toppagedesign.com/intime/?YEAR?EVENT
Where YEAR is the year the event took place in, and EVENT is what place it came in the events of that year. For instance, let's link to the beginning of the Battle of Britain:
http://toppagedesign.com/intime/?1940?2
It happened in 1940, so we set that as the first variable, and it was the second event that year, so we set '2' as the second variable.