How do I use this code to make a background image instead of a background color?

[obedientisland923]

I am making a profile on a facebook application, but I don't know much about html. I experimented by looking at the page source and found this:

<br /></div>
<br />
<br /></table>
<br /><div style="background-color: Black;">
<br /><center>
<br /><center><font size="4" color="white" font=”impact”><table style="background: transparent url("http://i532.photobucket.com/albums/ee329/siva0eminencija/untitled-1.jpg") repeat scroll 0% 0%;" valign="center" border="0" width="620" height="600"><td>


along with a bunch of other stuff. when i entered it into my profile it worked, my background became black. however, i'd like to use a background image from a url instead of just the black background? is that possible? also, is some part of this code unnecessary such as the "br"s? what do all the parts mean and how can i change them. thanks