I have noticed that a number of sites are making use of lines in the background that gives a very nice effect. Every time I try it (especially if the lines fade by a mask), the lines look distorted and out of place (or don't fade at all). I imported (cheated) one site that makes good use of this and when I copy their lines, it works. When I do it myself, it looks like &#%@. I looked all over to see what is different and I can't find a thing. Is this just me or am I doing something wrong?

Thanks in advance,