Really Large Fill Pattern

Hey, it's been a while since I've been here. Hi everyone, anyhow I came across a problem lately. Anyhow if you go to this site here
http://dr.animega.net/wallpaperselector.html
and copy one of those pictures and zoom in on it, you can see diagonal slash patterns. I've tried to makes these, with like 800X600 image then defining them as a patter but it doesn't come out right, of course I could just do it by hand pixel for pixel and copy and paste but it takes to long. So I was wondering if anyone can help me make a fill pattern like that one. THanks

1. Open a new document : 4px / 4px
2. With the pencil tool (set to 1px) draw 4 diagonal squares from
upper right to bottom left.
3. Select all and define your pattern.
4. Now fill your 800x600.
5. Make your @ zoom:100%..cause @ anything less the pattern
will look distorted.

Hey thanks man, just what I needed