Hide div when page accessed via thirdparty sites

[Copcleaceah]

I have a div. Its id is \[code\]testdiv\[/code\]I would like to hide that \[code\]testdiv\[/code\], if the website \[code\]not accessed directly\[/code\]. I mean lets say my website name is \[code\]example.com\[/code\]If someone accessed via \[code\]http://thirdpartysite.com/example.com\[/code\], then I would like to hide that div.Can someone give me \[code\]PHP, CSS or JS\[/code\] solution.