Weird code showing up on the front end
 

Hi,

For the past 2 weeks i had a little code bit showing up on zhe front end. Apparently something that generated itself in the header.php i managed to get rid of it and the website was working fine again. Just had to remove whatever was showing up. Anyway today there was this big chunk of code and i am clueless as to why this is happening. Is this a theme problem? Or is it caused by wp?
Id appreciate it if someone could have a look at it.

Www.kitchecker.de

Thx in advance,
1.21 gigawatts

looks like you have been hacked. do a google search 'wodpress site hacked' to see how to solve this.
Good luck