Help with fine tuning formula - date lookup concantonate

[sleepers]

Hi i have this great script that looks up my availabilities sheet and makes a nice avails roster which shows the dates available in a month etc

i need to be able to control which days show - eg. i only want fri and sat to list and bypass the thu and sun from the availabilities sheet.

avails setup
http://www.whirlwindent.com/test/avails.pdf


output
http://www.whirlwindent.com/test/output.pdf

code on output page
=IF(ISERROR(concatmth2(INDIRECT(I$5),C10)),"",(concatmth2(INDIRECT(I$5),C10)))

script

Function ConcatMth2(rng As Range, item As String, Optional dte = True)
    Application.Volatile
    For Each ce In rng
        If ce <> "" And Sheets(rng.Parent.Name).Cells(2, ce.Column) = item Then
            If dte Then
                holder = holder & Format(ce, "ddd d") & ","
            Else
                holder = holder & ce & ","
            End If
        End If
    Next ce
    ConcatMth2 = Left(holder, Len(holder) - 1)
End Function

[/code]

i need to be able to select the days i want and then the months will only show those variables?