Dependent drowpdown

I have a table (table name- candidates) (fields-id, name, picture)
(table name- vote)(fields- id,candidateID,name,picture)
The field picture is dependent on candidate name, so if i choose a candidate name i want to appear automatically the picture of the selected candidate.

Instead of the filename , I want the picture of the candidate to be shown.
It is possible to phprunner to display a picture on add page?
Sorry for my english.