[Tutor] slide show won't display the images in right order

[Joseph Quigley]

Hi,
Here's my directory listing as a list:
['ga041001.gif', 'ga041002.gif', 'ga041003.gif', 'ga041004.gif',
'ga041005.gif', 'ga041006.gif', 'ga041007.gif', 'ga041008.gif',
'ga041009.gif', 'ga041010.gif', 'ga041011.gif', 'ga000619.gif',
'ga050101.gif', 'ga050102.gif', 'ga050103.gif', 'ga050104.gif',
'ga050105.gif', 'ga050106.gif', 'ga050107.gif', 'ga050108.gif',
'ga050109.gif', 'ga050111.gif', 'ga050112.gif', 'ga050113.gif',
'ga050801.gif', 'ga050114.gif', 'ga050802.gif', 'ga050115.gif',
'ga050803.gif', 'ga050116.gif', 'ga050804.gif', 'ga050117.gif',
'ga050805.gif', 'ga050118.gif', 'ga050806.gif', 'ga050119.gif',
'ga050807.gif', 'ga050121.gif', 'ga050122.gif', 'ga050123.gif',
'ga050124.gif', 'ga050125.gif',  'ga780825.gif', 'ga780826.gif',
'ga780827.gif', 'ga780828.gif', 'ga780829.gif', 'ga780830.gif']

When I use:
files = os.listdir(<theimagesdirectory>)
x = 0
direction = 1
while True:
    ShowImg(files[x]) # An image display function
    x += -1

it doesn't display the images in the right order! It will skip from
ga050123.gif and go to ga050120.gif!

Is there any way to counter this?
Thanks,
    Joe

PS> This is a console version of the Tkinter version I want to make
(where I posted earlier). Console is just way easier! :-)