rollover image ?

Olla,

I would like to insert a rollover image to my sidebar.

This is my current code:

<img src=”http://demo.com/N/wordpress/wp-content/themes/N.main/images/icon2.gif&#8221; title=”title” alt=”alternative text” width =”the width in px” height=”the height in px”/>

Any one knows what is the code to insert a rollover image?

Thanks for your help,

~ Grace