Add Text That Fades In And Out to Web Page

I would like to add text that fades in and out (alternating between two lines of text and two colors) to a "speech bubble" graphic on a css/html web page. The attached .jpg shows an example of what I'm trying to explain. The web page is already created - a psd file that I converted to css online. I think it converted pretty well, but was thinking that someone who knows more about this than me should look it over and "clean it up," if necessary. I can send the [login to view URL], images folder, and style sheet to the selected bidder. Thank you!