Tiling background images

I am trying to tile a single small background image (one small photo repeated to fill the desktop) in Photoshop 5.5 and Windows XP for use as a mail background in Outlook Express. Is it possible to do this without Image Ready?
I have tried numerous things but cannot seem to do it. I am a complete novice with little knowledge of filters and layers.
Thanks....phal

Have you tried duplicating the layers?
-It's like this, resize first the canvass of your document.
-position the picture to be tiled at any corner of the document
-duplicate the picture or layer
-position the duplicate beside the original picture.
-merge the two layers
-now you have two small pictures in one layer
-duplicate the merge pics and position them side by side with
the other
-merge it again so now you got 4 pics in one layer
-just repeat the steps till you fill the whole document

An even easier way:
-- Open up the image you want to tile separately
-- Select all
-- Edit -> Define [as] Pattern

Then create a new image (the size of the background you want to use), and click on edit->fill and choose "pattern" instead of "foreground"/"background" or whatever the default is.

That was easy and it worked, I am very happy that there are much smarter people than me in this world.
Thanks!.....phal