Code:
BMAP* Haze_map = "PP_HeatHaze.tga";
BMAP* Blend_map = "Blend.tga";
action Eff_HeatHaze()
{
	set(my,PASSABLE);
	OS_HeatHaze_init(my,Haze_map,Blend_map,512,3,0,0.02);
}


Haze_map is the normalmap used for disorting which will be shiftet with the speed given by two of the parameters, Blend_map sets the disortion strength and transparency.

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com