This library subroutine preload() causes a client browser to request
alternative application images (e.g. for a slideshow or rollover) from the server
before they are first displayed in the page.
Preloading greatly smooths animation of rollover images, slideshows and other dynamic image replacement methods -- particularly for dialup users.
Note that instances of the image object
created within Preload() are purely local, are not
intended to and in fact cannot be accessed by other
page scripts