IMDILATE - similar kind of loop need to be generated - HELP required

Hi,

I am trying to make a loop that should work Similar to IMDILATE - a step before it gives the result for each pixel. If you look into the sample code below, you could understand more clear way

 a = [1 2 3 ; 4 5 6 ; 7 8 9 ] % input  
 b = ones(3,3) % say it to be struct element
 nw = b;
 for i = 1:3;
    for j = 1:3;

        if (i == 1 && j ==1)
for m = 1:2;
    for n = 1:2;
        nw (m+1,n+1) = a(m,n);
     end
end
        elseif (i == 1 && j == 2)
            nw = b;
            for m = 1:2;
                for n = 1:3;
                    nw (m+1,n)= a(m,n);
                end
            end

         elseif (i == 1 && j ==3)
            nw =b;
            for m = 1:2;
                for n = 1:2;
                    nw (m+1,n) = a(m,n+1);
                end
            end
        else 
            break;
        end
        display(nw);
    end
 end

Now variable nw displayed for the first row elements 1 2 3 .. in similar way I need your help to make it for 2 and 3 row too and also in a more generic way ... say my input and strel may vary on rows n columns (not fixed to (3,3))

Thanks in advance