jQuery
jQuery is a Javascript Linrary of functions and scripts that I came across when I was looking at the code needed for a Timed Modal.
No doubt using jQuery may make some of what I am trying to do here a little simpler, but for now I am just recognising that it is there if I need to use it and to put references to it into context.
What jQuery say about themselves on their website:
I have only used jQuery in examples that illustrate other programing techniques on this website.
The W3C website has a tutorial for the use of jQuery.