Yes this is an example from w3schools to make a button load a other file without refreshing:
http://www.w3schools.com/ajax/tryit....=tryajax_first
As you can see, the button calls the "loadXMLDoc" function which changes the content in a div with the id "myDiv".
In my own project for uni I combined that example with a timer to continuously refresh a page without seeing the refresh
Ajax is easy, you just need to combine javascript and xml in a clever way
lot's of tutorials: http://www.w3schools.com/ajax/default.asp







