Can't centre my logo - FAQ instructions didn't work for me

[splanchak]

Hi Everyone,

I'm new to Zen and CSS. I used the FAQ tutorial to try and replace the default logo with my own. It worked, except that the logo is floating right and it's supposed to be centred. I followed the instructions, but it isn't working.

My site is here:
http://www.clothdiaperkids.com/zen/i...=index&cPath=1

And my code is this:
#logo, .centerBoxContents, .specialsListBoxContents, .categoryListBoxContents, .centerBoxContentsAlsoPurch, .attribImg {
float: left;
}

#logo {text-align: center;}

Also, how do I remove the pillar graphic behind my logo?

Help is much appreciated,

Stephanie