The splash panel now appears only once when the homepage is opened from the landing page. Thereafter, the homepage can be refreshed as many times as one likes without having the splash panel reappear.
This seemingly easy task took several days of research to achieve and opened up an entirely new source of programming code. This said, the code that finally made it work is amazingly simple — a simple if-statement whose condition is the state of the window object’s performance.navigation.type property and the appending of the jQuery .off() method to the .colorbox() jQuery plugin.
Hooray! Hooray! Now I can develop the splash panel with good confidence that it will not become a burden to the user, rather an enticement for his further investigation.