How to assign multitexture coords using vertex array?

hi,
I cannot find the way to assign multitexture coordinates when I am using vertexarrays. Can anyone help me ?

glClientActiveTextureARB(GL_TEXTURE0_ARB+channel);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2,GL_FLOAT,SIZE_OF_VR_VERTEX,ptr);