Hi!
You can solve it with a little work-around consisted of two parts:
First, look into this method that lets you execute functions (and code in general) with a delay specified by you.
Then, you should use the openLightbox( ) method in order to manually open your Lighbox.
Combining these two will allow you to open the lightbox with any delay you desire.
Just make sure that you put the code snippet for this in the onReady function of the page so the counting will start when the page is loaded.
Hope it helps!
Best of luck.
Doron. 