What this Url ending means .....&123 ?

Question

Hey I am having some issues while using Nggalley plugin for wordpress

the plugin makes use of a JW player and JW player needs an XML - so it requests link like this http://nextgen-gallery.com/index.php?callback=imagerotator&gid=1&149 The lay &xxx really creaps me out couse I am using it for joomla and joomla doesn't like this I am assuming that this has to do with wordpress but still unsure.

what does this ending of URL really mean?

PS. I would never ever use wordpress plugin in joomla but my client uses and I have to fix it

Answer 1

Are the numbers different on each page refresh? If so, my guess is that it is to prevent caching (the browser sees the URL as a different URL with the random number appended to the end.)