Help required with custom header,

Hi there,

I use Third style as my theme for my wordpress website however i got some problems to fix the new header.

Currently i have build the website and i upload a custom build which a friend of my created: Current Website

THe new header doesnt show correctly, the orriginal header looks like this: Header picture

Can anyone help me out to get the full header availible, i was thinking to make the header area in the stylesheet bigger however i was unable to find it.

Thanks in advance.

Andres