The word every is a determiner. Determiners normally take no articles (which are determiners themselves). There are a few exceptions but every isn't one of them, I think. BTW every needs a singular noun. (every stages is wrong)
Thanks a lot. Actually I wrote it to get an answer to show my friend(and enemy) who always insists his studenst to use 'the' before 'every'. He also says 'my' is a 'pronoun'. Notonly that once he used my system and gave a wrong answer and even spoke rudely to one of our moderators namely Mr.MisterMicowbar. After that I almost stopped visiting this site. Anyway thanks again Mr.