How do you highlight your photo ?
sorry, I mean on mouse over of the photo I need to executre the script
You can't perform a script on mouser over in FileMaker.
However, in this case you could use "tooltip". In layoutmode, choose the photofield in the portal, then under the appearance tab in the inspector you can add a tooltip to the layoutobject (photofield). Click on the pencil next to the tooltip input field and, in specify calculation, reference to the related field containing the description.
Thanks for the idea by the way, haven't thought of it before!