if you have server somewhere that automatically updates the data you need..you only need to connect to it and parse the XML and display it in your page....but I guess thats what you are haing problems with??? right
if so give me some more details of it and I shall see to it..
For that I am pretty sure you will need a server side programming here is why.
(all of the above is presuming that the feed is being served from another domain/web server)