Double sorting using an alphabetic filter bar

jeremys

I have dataTables sorting by column, now I want to add an alphabetic bar across the top of the table (a, b, c, d....) so that when the user clicks on a column to sort it, they can also click on one of the letters to bring up values in that column that start with that letter. So, if they have column 1 sorted, then the click "A", everything comes up where the values in column 1 start with the letter A.

Any ideas? Thanks in advance!