mistados

No im refering to the portfolio images, how they change from one image to another..like image sprites, but its not whats being used..

I don't think the above method is achieved using sprites..

Hey guys, If you visit this site; http://devatic.com/?theme=Daisho you will see when you hover over a portfolio item that a nice overlay effect takes place, im wanting to know how to do this, not the whole portfolio or multiple images like on the above site, just have that same overlay effect on hover of the image turning all one colour with custom text and links.. Has anyone done anything like this and know how its done?