thanks again eschwartz or should I call you "Speedy Gonzales" as you are so fast to answer me ???
I think your solution would be ok but the only thing is that when it comes to comic books , I'm used to search in both ways .... sometime I'll search for the author and sometime i searched for the illustrator (I list both of them as co-authors using a "&" to separate them )
do you think that I could do this differently and getting the same result (ex: maybe if I create a new column for the illustrators names / second author name ???)
thanks again Speedy