Need help with Image Rollover

[chrbar]

Hello,

I'm looking for an Image Rollover script with a gradual effect... one where we can choose the transition duration!
Do you know a script which works with FireFox and Safari?

I found one on DD Web site "Dissolving Image Rollover", but the transition duration works with IE only!
http://www.dynamicdrive.com/dynamicindex15/dissolveroll.htm

Thanks,
Chris