imagebox onload fix

I have an image box running at a webapp I long time ago have installed using a php skin, whose slidebox tags are like one attached here. I want it to work on a different site as onload script as a full screen page over main contents opacity 5% or optimized behavior, and disappears at a prescribed time period and a button to close it. Once run, the script and full-screen behavior won't repeat when visited again. Check the reference site at [login to view URL] Your task: implement the same behavior as in the attached file but with onload, fullscreen and as I explained above. budget: USD 20