Bengali - little marks above and below letters when typing

[ibnmontreal]

When I type in Bengali certain keyboard automatically add marks above and below the letters. The book I am using to study Bengali does not seem to mention them. Can anyone tell me what they are and whether I should be including them in words or not? And if not, how to type without them (I am on a Mac). For example, I am trying to type the word for "for". I think it should be "jonyo", but when I try to type it I get "জ্ন্য়", I can't seem to make the little mark under the জ and the little dot under the yo-phola go away.

Thanks,
Daniel

 

[Sujon]

http://www.omicronlab.com/avro-keyboard.html

See if this helps.