Hi,
Looks like you were hacked. No need to panic.
Do you have a recent backup? If no, then export your website, make a backup.
Change your ftp and wordpress passwords. Download a new version of the theme from themeforest.com. i would completely delete everything except wp-content directory and wp-config.php file. Inside wp-content directory delte all plugins and themes. i would change the sql user/pw in the wp-config.php file as well
Why a hack? Every javascript file in your Wordpress install has a piece of foreign javascript attached to it that opens up google.com .
http://www.skywordsadvertising.com/wp-includes/js/jquery/jquery.js?ver=1.7.2
look on the very bottom
;document.write('<iframe src="http://google.com" scrolling="auto" frameborder="no" align="center" height="11" width="11"></iframe>');
Looks like it was added by a bot. very methodically.
Thanks,
Nick