GTK Shader

Guys i made a map, and there are certain areas i want the walls the be invisible, how do i do it? i thought using chulk shader would do the trick but when i compile and test the map, it showed the wall (pink and it says chulk shader) so how to make it invisible?

Add ur material to the shader list

// paste comment here
Texture Path
{
surfaceparm nodraw
qer_editorimage "image path thats shown on radiant"
}

Btw, be sure to check on gunz the "use shader" ;)