Slideshow op homepage

Hello,

To let work content slide on mij homepage (theme=twenty eleven) I have to add a code to the header.php. But what part of the code do i have to remove? And where do i paste the code exactly??????? I tried a long time but did not succeed.

Where exactly do I put the code. . The code is:

[Large code excerpt removed by moderator per forum rules. Please use the pastebin for all large code excerpts. It works better anyway.]