I have a knitting question...

First, the red/orange/blue scarf is the first "real" project I made and it's like really, really big, but I still love it & since it took me over 2 months to make & during those two months my cats often used it as a mini blanket or gnawed on the yarn as I knitted, I decided to keep it for myself because almost everyone I would like to give my first "real" knitting project to is allergic to cats.  When I finished, I was so thrilled that I eagerly started on my second knitting project...another scarf.  Of course, this time it was going to be different, way smaller with less girth so that I could finish it before the cats could lie on it, but something is going terribly wrong.  It's the blue one on top - do you see how it curls?  What the hell is that?  On the other scarf I simply knitted it, but on this one I've been alternating between one row of knitting & one row of purling - could that be the problem?  It's the same material as the other scarf so I don't think that's the reason.  If you have any advice, I would appreciate it ~ email me at carrie@beadtree.net.  ** Later on ** Thanks for all the responses!  I now know what I have to do to stop the curling!  I also now know that there's sure a lot of knitters that love lampwork beads.  Very cool!