Wow that page is messed! If you look at the source, after the startof the left sidebar, it suddenly spits out the '<head>' again!?!
also you have this srange line of code at the top
HTML Code:
<meta name="verify-v1" content="HKV8actvDQmEPIJW5W2Icbdgy2iZU/T0N8ckOlmoCjI=" >
Try backing up the atahualpa folder, then delete it from the themes folder and see if you can get running with the default theme.