How do i do this ?

[veenuisthebest]

In my PHP script, I want to change directory only when the user has referred from the root of the domain i.e. http://www.domain.com and NOT when referred from http://www.domain.com/forum

something like this:-

if(referrer = "http://www.domain.com")
{
       chdir('forum');
}
else
{
      no chdir
}

how do I achieve this ?

thank you