There are two things that you need to have to make a counter work. So now you have a counter on your page, but lets say you want to change the look of it. Well you can.
T tells the counter to put a comma in the counter, etc.
Using these attributes, you can change your counter in many ways. Feel free to experiment with these attributes until you find the counter that fits your page. Below is a table of all the attributes that the counter supports. Look them over and play around with the settings to get a counter that you like. For counter, this parameter is not need as counter is the default display type.