Modify script to loop through all files in directories

Hello,

I think this script would work great if it would cycle through all the rasters in each of these folders and then save a new output raster for each iteration. Currently it justs goes the directory as listed I need it to cycle through all of the directories within my sys.argv[2] and sys.argv[3]

(a raster is directory containing several files that is recognized by ArcMap as a single unit or "file")

donut = sys.argv[2]
lc = sys.argv[3]

Each of these directories contains several other directories that are the input  rasters.

I would appreciate help to do this,
Thanks,
MJ
I am new to scripting and I would appreciate any help and annotation.

Thanks,
MJ

# Import system modules
import sys, string, os,  arcgisscripting
 
# Create the Geoprocessor object
gp = arcgisscripting.create()
 
# Check out any necessary licenses
gp.CheckOutExtension("spatial")
 
# Load required toolboxes...
gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Spatial Analyst Tools.tbx")
 
# Script arguments...
outRaster = sys.argv[1]
donut = sys.argv[2]
lc = sys.argv[3] 
 
InExpression = "CON(ISNULL(%s), %s, %s * -1)"%(sys.argv[2],sys.argv[3],sys.argv[3])
 
# Check out Spatial Analyst extension license
gp.CheckOutExtension("Spatial")
 
# Process: MapAlgebra
gp.SingleOutputMapAlgebra_sa(InExpression, outRaster)

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