Function to post on facebook friend's wall

I want a function which on calling post to facebook friend's wall. I am looking for simple function which can be easily integrated with m PHP website. i am looking some thing like this. facebookwallPost($url,$msg); //Calling function url and msg is passed as parameter. facebookwallpost($url,$msg) { //funciton to post on user friend's wall } I am looking for a quick help