Updating External Variables

I need a little help, I am still farily new to javascript and am having trouble figuring out a way to update an external variable.

I have a home automation software package with a built-in web server. On a html page I can view any variable from the automation software using {{variablename}}. Only problem is that if the variable is changed it will not update on the web page unless the page is refreshed. I need help with a script that will constantly update all variables contained in a page without having to reload the page.

Any suggestions??

Google around AJAX... except there really is no script for it and will have to be written into the code yourself.