Night Themes Series V2 (Blue / Blue (MP) / Green / Red / Pink) - Yellow Next

[amywinehouseforum.co.uk]

i didnt put them inbetween the <h1> tags. I did this:

 	<div class="logo" align="center">
<img src="http://i137.photobucket.com/albums/q236/amywinehouseforum/Image15.png" border="0" alt="www.amywinehouseforum.co.uk">
			</div>

Do you reckon that's ok? Why shouldn't I exceed the size of the header or use <div> tags? I dont understand!?
And also I made sure my image was saved as a .png. The current logo I'm using is absolute crap but I can't seem to get any good ideas for a new one.