Glass texture

Hi There,

How can I include non-transparent areas into a glass texture?

I already have this material script:


textures/darkmod/glas/butze
{
	twosided
	noSelfShadow
	translucent
	glass
	forceoverlays

	qer_editorimage	textures/darkmod/glas/butze.tga

	diffusemap	textures/darkmod/glas/butze.tga

	{
		vertexProgram	heatHazeWithMask.vfp
		vertexParm	0	0
		vertexParm	1	1.5
		fragmentProgram	heatHazeWithMask.vfp
		fragmentMap	0	_currentRender
		fragmentMap	1	addnormals (textures/darkmod/glas/butze_local.tga,
					heightmap  (textures/darkmod/glas/butzebw.tga, 5) )
		fragmentMap	2	textures/darkmod/glas/butzebw.tga
	}
}

Thanks for help, Ed