First thing:
DELETE FROM tblemployee t,tblemployee e
These are both same tables, so thats why you're getting error. Guess it should be:
DELETE FROM tbltimpunch t,tblemployee e
Because you're deleting from multiple tables, query should be something like this:
DELETE t, e
FROM tbltimpunch t
INNER JOIN tblemployee e
WHERE CAST(t.employeeID AS SIGNED) = e.employeeID
AND e.employeelname ='EnterNumber'
AND dateoftime ='2013-07-02'
AND timein ='09:00:00'
AND timeout = '15:00:00'