i've got links on a website that takes the user to different parts of the same page (i.e, no reloading of the page)

I would like 2 things to happen when a link is clicked:

1) the url changes eg. from mysite.com/home to  mysite.com/about when the about link is clicked.

2) when refreshing the page that it stays where it's at and not go back to the top of the page.

thanks