White space between header and content

Sorry, this is driving me crazy. I have a white space appear between my header and content div and I can’t find out why. I have looked at the code with firebug, but can not see anything there… Could you please help? Below the url (please bear in mind that this website is in development, so not finished at all)

http://www.birthdaymagiciannyc.com/corporate/

Many thanks
Eva