How to switch hyperlink images

I have a small image and a large image, and the page shows a small image. when the mouse goes over to show a large image, and the picture is a hyperlink. How can I use CSS to switch between two images ?, HTMLcode & lt; style & gt;. _ NO {width: 80px; height: 100px; border: 1 p can you tell me how to switch over a hyperlink image?
I have a small image and a large image. The page shows a small image. when the mouse goes over to show a large image, and the image is a hyperlink.
How can I use CSS to switch between two images?

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HTML code