OK, let me get this straight. You're data looks something like this:

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2001
2002
2003
2004
2005

And you want to plot data like this:
Jan 2001
Feb 2001
Mar 2001
....
Oct 2004
Nov 2004
Dec 2004
Jan 2005

I believe I've seen someone do something with Pivot tables to get to what
you want. I'm not sure how to get it laid out. Someone else will have to
step in here.