Simple jquery lightbox change

I have the jquery Lightbox evolution script that is working correctly on my page by loading a youtube video when the page loads. I'd like to make a modification to it so that when the page loads it pops open the light box with some text and our Facebook like button so that people can like our facebook page. After like button is pressed, it will save cookie to client's computer for 90 days, so it will not popup again. I do want to be able to customize the text that is displayed