Hi, I have a problem regarding python script. I worte an script to convert dbf to csv

Hi, I have a problem regarding python script. I wrote an script to convert dbf to csv. I use a model builder to create a dbf file and by using that python script I want to get csv format of the output. However I don't know how to set input and out parameters in python to use it in model builder.
Here is my code also:
import csv,arcgisscripting
from dbfpy import dbf
gp = arcgisscripting.create()

try:
inFile = gp.GetParameterAsText(0) #Input
outFile = gp.GetParameterAsText(1)#Output
dbfFile = dbf.Dbf(open(inFile,'r'))
csvFile = csv.writer(open(outFile, 'wb'))

headers = range(len(dbfFile.fieldNames))

allRows = []
for row in dbfFile:
rows = []
for num in headers:
rows.append(row[num])
allRows.append(rows)

csvFile.writerow(dbfFile.fieldNames)
for row in allRows:
print row
csvFile.writerow(row)

except:
print gp.getmessage()