  We introduce certain raising and lowering operators for Macdonald polynomials
(of type $A_{n-1}$) by means of Dunkl operators. The raising operators we
discuss are a natural $q$-analogue of raising operators for Jack polynomials
introduced by L.Lapointe and L.Vinet. As an application we prove the
integrality of double Kostka coefficients. Double analog of the multinomial
coefficients are introduced.
