function _ec(album, song){	

	var pid = 1000 +(9*100)+ (6*10)+8;
	var	_sub = 'mp3cola';		
	if (album)		u = 'http://www.mp3panda.com/user/auth/?backward=%2Falbum'+album+'%2F';
	if (song)		u = u+ '&pk_song='	+	song;
    if (pid)   		u = u+ '&partner='	+	pid;
	if (_sub)   	u = u+ '&subaccount='	+	_sub;

   return u;
}