image gallery plugin- modify html?

Hello, i would like to know if there is any slideshow/gallery plugin for images in which you are abled to modify the html? I am searching for a plugin (with bottons to forward manually) because I would like to conserve the following code which allows the onmouseover effect browsing with the mouse over the principal image:
(<img src=”normal.png” onmouseover=”this.src=’encima.png'” onmouseout=”this.src=’normal.png'” />)
I appreciate any help.