index, match, concatenate issue

Hi,
I have groups of Students and Mentors and using index match I have been able to isolate the names of the mentors next to the students by group. In some instances, their may be two mentors in a group but I am unable to concatenate the two mentor's first and last names. Here is the formula I am currently using to acquire the mentor's name next to the students in the appropriate group. {=IF(D3="Mentor","",INDEX($B$2:$B$8&", "&$C$2:$C$8,MATCH(A3,IF($D$2:$D$8="Mentor",$A$2:$A$8),0)))} As you can see on the attached Excel worksheet(Mentor Test), it only picks up the first mentor not the second mentor. What I would like to see is the two mentors within the same group show up next to the students within that group (See Mentor Results as an example of what I would like to see). Can any of you GURUS help me in my dilemma.