thanks alexander for the help.

I have implemented as what you said and as what is written in the WDL file

But I am not able to get the skin2 ( base texture) to show up in the terrain.

I do get skin3 , skin4 and shadowmap by using masking in the RGB channels
of skin1 but I'm not able to see the Skin2 ( base texture)..therfore still i have only 2 textures on the terrain....

Anybody knows how to do it ?