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delete multiple field using python

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Hello

System Windows Vista / ArcGIS 9.3

I have ten shape files.
Each of them has the fields starting with D in the attribute table. (D8739, D1983)
Some have 10 D fields, and other have about 20.

Now I want to delete the D fields using python.
However, no D field was deleted after running the code below.
Please kindly help to modify it and thank you in advance

Code:

##Script Name: calculate sum
##Description: calculate sum of merged range sizes of a taxonomy of migratory birds
##Created By: Elaine Kuo
##Date: 26/05/2012
       

#Import standard library modules
import arcgisscripting
import os

#Create the Geoprocessor object
gp = arcgisscripting.create(9.3)

#Set the workspace.
gp.Workspace= "H:/temp_D/test_1"
#gp.Workspace= "H:/temp_stage_2_3_polygon_limit_1984_no_R_O/P_Turdidae_22"

#Set the workspace. List all of the feature classes in the dataset
outWorkspace= "H:/temp_D"
#outWorkspace= "H:/temp_stage_2_3_polygon_limit_1984_no_R_O"

#Get a list of the featureclasses in the input folder
fcs = gp.ListFeatureClasses()

# Loop through every item in the list that was just generated
for fc in fcs:

    # Break out the name, no path or extension, using the describe object.
    desc = gp.describe(fc)
    featureName = desc.name

    # Make temporary featureclasses
    gp.MakeFeatureLayer(fc,"lyr")
   
    #  Get a list of the fields in the featureclass
    fields = gp.ListFields("lyr")
   
    # Loop through every item in the list that was just generated
    for field in fields:

        if field.name[1:4] == "D":
            gp.deletefield ("lyr", field.name)     

    #Validate the new feature class name for the output workspace.
    #OutFeatureClass = outWorkspace + os.sep + gp.ValidateTableName(fc,outWorkspace)

    # copy feature
    #gp.CopyFeatures("lyr", OutFeatureClass)

    # clear memory of layers
    gp.Delete("lyr")

gp.AddMessage(gp.GetMessages())
print gp.GetMessages()


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