Headers?, Confused Options

[midnight6333]

Sorry if this is in the wrong topic...I'm new still...

I have 2 questions:

1. how do you center a header?

all i know is

<!-- begin code provided by createblog.com --><br /><div id="content"><div class="sidehead">Updates</div><br /><!-- end code provided by createblog.com -->

so its on the left...and

<!-- begin code provided by createblog.com --><br /><div id="content"><div class="contenthead">Updates</div><br /><!-- end code provided by createblog.com -->

so its on the right...

2. I want to get a picture in the middle of my page...its an animation...I personalized this layout:
>>>HERE<<< where the little girl is...is all black...I want to put animation there...I know its a still picture and I tried to put it into frames and use it that way but it wouldn't go the right speed...help?

Thanx~Midnight