in HTML, url contains #, scroll page to header?

Just markup the header on the target page with the id "about" i.e.

<h1 id="about>About</h1>

That way your link on the linking page http://www.thisisawebsite.com/page.php#about will go straight to the "about" header - a h1 in this example but it could be whatever you'd given the id of "about". Remember you should only use the id "about" once on the page though.

You need to define the anchor in your markup (near your 'About' header):

<a name="about"></a>

Anyone else having a question about this should explore using an ID attribute on the actual element they want to link to:

<h1 id="about">About</h1>