Different tiling for two textures in one shader

Hey guys,
just as about any post here starts: I have no clue about shaders ;-)
What I am trying to achieve is: I want a texture (transparent <- alpha channel) to be covering a certain object and using the tile modificator to, well, make it tiled.
I have a second texture, basically a second alpha map, that blends certain areas in or out. This texture however has to be independent of the previous mentioned tiling.
Same for Offset.
You can see what I mean in the attached image, red being my (tiled 4x4) texture, green being my additional alpha.


What I have got so far is a shader that does blend the two alpha channels nicely, but as soon as I change the tiling of the main texture also the additional alpha will change its tiling.
Changing the tiling of the alpha doesn't affect the image at all.
Heres the code:

Code (CSharp):

1.  Shader "Transparent/Diffuse + Extra Alpha"
2. {
3.      Properties {
4.      _Color ("Main Color", Color) = (1,1,1,1)
5.      _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
6.      _AlphaMap ("Additional Alpha Map (Greyscale)", 2D) = "white" {}
7. }
8. SubShader {
9.      Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
10.      LOD 200
11. CGPROGRAM
12. #pragma surface surf Lambert alpha
13. sampler2D _MainTex;
14. sampler2D _AlphaMap;
15. float4 _Color;
16. struct Input {
17.      float2 uv_MainTex;
18. };
19. void surf (Input IN, inout SurfaceOutput o) {
20.      half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
21.      o.Albedo = c.rgb;
22.      o.Alpha = c.a * tex2D(_AlphaMap, IN.uv_MainTex).r;
23. }
24. ENDCG
25. }
26. Fallback "Transparent/VertexLit"
27. }
28.  

Thanks

 

Never mind. Heres the solution - in case someone else searches

Code (CSharp):

1.  Shader "Transparent/Diffuse + Extra Alpha"
2. {
3.      Properties {
4.      _Color ("Main Color", Color) = (1,1,1,1)
5.      _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
6.      _AlphaMap ("Additional Alpha Map (Greyscale)", 2D) = "white" {}
7. }
8. SubShader {
9.      Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
10.      LOD 200
11. CGPROGRAM
12. #pragma surface surf Lambert alpha
13. sampler2D _MainTex;
14. sampler2D _AlphaMap;
15. float4 _Color;
16. struct Input {
17.      float2 uv_MainTex;
18.      float2 uv_AlphaMap;
19. };
20. void surf (Input IN, inout SurfaceOutput o) {
21.      half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
22.      o.Albedo = c.rgb;
23.      o.Alpha = c.a * tex2D(_AlphaMap, IN.uv_AlphaMap).r;
24. }
25. ENDCG
26. }
27. Fallback "Transparent/VertexLit"
28. }

Note the changes in Line 18 and 23.
Cheers