I started taping Scampers ears at 3 months old. Today both of his ears are up and have not gone down since. Here is a link that shows how to tape ears, this is the way that I did it, it is the easiest way and works best and I recommend doing this method over the other one!!!
http://members.cox.net/jrogan/ears.html
The other way is where you support the ears by running tape across them, but I found it nearly impossible to get their ears to stay up using this method, and it easier for them to get the tape off, but I will post that link too for you in case you want to do it this way.
http://members.aol.com/CYorkie/TapingEars.html http://glassyorkies.homestead.com/care.html