Circular For Not Opening Personal Emails In Office

Hi All
I need to pass a circular since we are locking all the website.The Circular wolud be Mentioning all the details as Not to use Yahoo chats and other website during the work hours....
Please suggest me something ....this is Quite urgent
Regards
Megha

Megha formulate an Information security policy and then conduct a small training for all highlighting the good practices and non conformances.
do not proceed with bits of policies in isolation ie today you start with emails/ trow internet/ next comes cellphones..
analyse business risks, mitigation plans and then proceed.
there are 127 controls in ISO-27001 (information security mgmt systems) so let me know if you need further help..
suryavrat