This isn't hard either. You just place the overLIB code in onClick instead of onMouseOver. These parameters command overLIB to behave in a certain way, hence we call them commands. The first command to a popup is always just a text string inside of single quotes. In any order you want.
Some commands expect to receive more than just a command though, it also want some data.
When that is the case the next parameter is expected to be that data. Lets go through the commands in this call to see what actually happens. There are more than 40 different commands that you can play with. The commands only last for that specific popup. Sometimes you want to make changes to many pages or just one page.