Reading variable from an outside source.

Hello, I am creating an approx. 60 hour course. I have a lot of html5 animation included throughout this course. Right now the web objects are "hard coded", but the issue I'm trying to address it to avoid having to re-visit all the links once the project is done and delivered to the client. So I'm thinking that if I could place on the server some sort of text file with only the server address, then I could install this course anywhere, change the text file's server name then the web object would read the variable + animation file name... so it would go something like this .. variable X = "https://servername.com/" and the webobject would be  "X+animation.html"...

thx in advance for your help.

Marc.