dhoa –
Like alchymyth, I was able to pull an existing image that was already on your page and shove it into the header using firebug, but your ‘banner’ jpg doesn’t seem to be existent in the folder you’ve got it pointing to in the css file.
to prove it works, just plug this in the css file under your #blog-title element and REMOVE it from the ‘#blog-title a’ area.
background:transparent url(https://www.aerismorpheme.com/wp-content/uploads/2009/12/parad_pomeg.jpg) repeat scroll 0 0;
once you see that it works, just replace the parad_pomeg with whatever pic you want, and remove the ‘repeat scroll’ properties
the ONLY other thing I could think may be causing a problem is that you don’t have the image checked in with Dreamweaver (if you’re using dw for ftp) – depending on your settings and your server settings, it could be locked up and prevented from displaying. this has happened to me once before –
good luck
