Who is the captain of the team in Essex county? 
{'header': ['Team', 'Location', 'County', 'Division', 'Home ground', 'Coach', 'Captain'], 'page_title': 'Friends Life t20', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text', 'text', 'text'], 'id': '1-18461635-1', 'section_title': 'Teams', 'caption': 'Teams', 'rows': [['Derbyshire Falcons', 'Derby', 'Derbyshire', 'North', 'County Ground', 'Karl Krikken', 'Wayne Madsen'], ['Durham Dynamos', 'Chester-le-Street', 'County Durham', 'North', 'Riverside Ground', 'Geoff Cook', 'Phil Mustard'], ['Essex Eagles', 'Chelmsford', 'Essex', 'South', 'County Ground', 'Paul Grayson', 'James Foster'], ['Gloucestershire Gladiators', 'Bristol', 'Gloucestershire', 'Midlands/Wales/West', 'Nevil Road', 'John Bracewell', 'Alex Gidman'], ['Hampshire Royals', 'Southampton', 'Hampshire', 'South', 'Rose Bowl', 'Giles White', 'James Adams'], ['Kent Spitfires', 'Canterbury', 'Kent', 'South', 'St Lawrence Ground', 'Jimmy Adams', 'Robert Key'], ['Lancashire Lightning', 'Manchester', 'Lancashire', 'North', 'Old Trafford', 'Peter Moores', 'Glen Chapple'], ['Leicestershire Foxes', 'Leicester', 'Leicestershire', 'North', 'Grace Road', 'Phil Whitticase', 'Matthew Hoggard'], ['Middlesex Panthers', 'London', 'Middlesex', 'South', "Lord's", 'Richard Scott', 'Neil Dexter'], ['Northamptonshire Steelbacks', 'Northampton', 'Northamptonshire', 'Midlands/Wales/West', 'County Ground', 'David Capel', 'Alex Wakely'], ['Nottinghamshire Outlaws', 'Nottingham', 'Nottinghamshire', 'North', 'Trent Bridge', 'Mick Newell', 'Chris Read'], ['Somerset', 'Taunton', 'Somerset', 'Midlands/Wales/West', 'County Ground', 'Andy Hurry', 'Marcus Trescothick'], ['Surrey', 'London', 'Surrey', 'South', 'The Oval', 'Chris Adams', 'Rory Hamilton-Brown'], ['Sussex Sharks', 'Hove', 'Sussex', 'South', 'County Cricket Ground', 'Mark Robinson', 'Michael Yardy'], ['Warwickshire Bears', 'Birmingham', 'Warwickshire', 'Midlands/Wales/West', 'Edgbaston', 'Ashley Giles', 'Jim Troughton'], ['Welsh Dragons', 'Cardiff', 'Glamorgan', 'Midlands/Wales/West', 'Sofia Gardens', 'Matthew Mott', 'Jim Allenby'], ['Worcestershire Royals', 'Worcester', 'Worcestershire', 'Midlands/Wales/West', 'New Road', 'Steve Rhodes', 'Daryl Mitchell']], 'name': 'table_18461635_1'}