Just like when you knit every row and get garter stitch, when you purl every row you get garter stitch too. The back of a knit is a purl, the back of a purl is a knit. If you want stockinette - knits on one side, purls on the other - you have to alternate. Knit one row, purl one row. Look at the Basic stitches videos on the Tips page.
sue- knitting heretic