How to evaluate an open access journal? Possible Duplicate:
  How do you judge the quality of a journal?  




How to evaluate the genuineness/authenticity, impact, significance &amp; reputation of an open access journal? The prestigious journals have Impact factor &amp; various indices, What about open access journals?

EDIT: Although a previously asked question has garnered many responses, this question is only toward open access publishing.
In the same way you evaluate quality of a non-open access journal: who are the people on the editorial board, what kind of papers do they publish, etc.