How do you make link picture change when you mouse over it?

I want the picture of the link to change to a different one when you mouse over it on my webpage. Im using Adobe golive, but just the source code would be prefered. : )How do you make link picture change when you mouse over it?
Read http://www.w3schools.com/JS/default.asp

Pay attention to DOM...

You will need a JavaScript function in onMouseOver event of your link...

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