It came up fine yesterday. But it is slow loading today for me. Try these two sites. One is just instructions the other has a diagram. Hope this will help.
http://www.alwaysquilting.com.au/mak...quilt_back.htm

http://www.ehow.com/how_6012433_piec...t-backing.html

Many, many of my quilts are reversible. I use up what I have left over and create a pattern for the back. The one I made my daughter, her boyfriend liked the back better than the front.

90% of the time I buy the 90x108 backing....If I can't find the color I want I piece

This idea is so simple so why didn't we all think of it before? LOL! It isn't aways possible to find the right extra wide backing so this method is quick and simple and I'm going to use it. May in Jersey

We had 2 different long arm quilters at out guild meeting and they said that if piecing the back that the seams should go horizonal since when you quilt the other way they seem to drag away and make a ripple. I like the idea of sewing both sides but will do it horizonal.

It has always been recommended that the back be seamed in two places and not down the center. This makes it easier to straighten up the back. And always remove the selvedage to remove stress and possible stress. To add on either side makes it more difficult to keep the seams even up and down.

Check John Flynn's method. It is good for some widths.

However, I prefer to have one piece for backing. When you calculate the cost a wide backing may be about the same expense as using narrower fabric. The difference in time to align the back may be worth the difference in cost.

I usually buy 108" wide fabric on sale or from Marshall Dry Goods.
If I do piece a back I like to create a center and surround it with a solid to the size I need.

Mostly I make small baby or lap quilts from what I have here, so if I make a big one I split the fabric in half vertically. If it is still not big enough, I just use scraps of what I have.

If buying fabric for a quilt it can be quite expensive. I most always go on ebay and but a "cheater quilt" and use it. Most of the time you can get them for under $20 and when used you have a reversible quilt.

I like this, too. That way you have a 2 nice looking sides!