How show a mouse over or watermark for a database image field within a grid

Hi,
I got a grid with a database image field column . The meaning of field is the “Status” of a ticket like Open, In progress, Pending, Resolved, Closed…
Each status has a image connected.
I can show the icon (image) on column but I would like , using mouse over the icon, to show the meaning / translation of the image.
Where need I to make this and how. On this kind of field and on grid there is not the Help description as in the form field…
Thanks