Help with hover

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Hi, as you will probably guess, I am fairly new to creating websites. I have set up a page where I am showing mug shots of choristers and I would like to bring up a block with their biography when somebody hovers over the picture. Is this possible and if so how?

 
Cahueya replied on at Permalink Reply
Do you want to show the "biography box" inside the are where the mugshot is shown or do you mean a modal that hovers over the screen (which I think would be horrible UX if happening on hover)
swinn replied on at Permalink Reply
Inside the area where the mug shot is would be ideal