Mantel test, Arlequin and Fsts


I am trying to figure out how to carry out a Mantel test and need some advice on which software to use and the type of input files...(at the moment I know of Arlequin..but have no idea how to make the input files for this software).

My data is pairwise fst values for multiple populations..I have this data for the introns and exons of my gene. I want to see if there is a correlation between the data for introns and the data for the exons.

Can anyone tell me:
1)A good user friendly piece of software to do this
2)A basic idea of how an input file would look
3) a quick overview of the Mantel test (this is new to me!)

Many thanks!