What Nate is referring to is called blocking strings. You mute out unwanted notes with the fretboard hand, or by palm muting with the picking hand.
I would probably palm mute with the picking hand for this, but try it both ways to see what works best for you.
JD
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Latest Tutorials
Bending The Flat 7 To The 1
Chicken Pickin'
Hybrid Picking Exercises: One Finger
Hybrid Picking Progression In A
Double Stop Progression In A
Crosspicking Combinations
Behind The Nut Bends On The G String
Behind The Nut Bends On The B String
My Lessons
http://www.youtube.com/jdfenderbender
myspace.com/jdjarrell
myspace.com/guitartrickscountry
twitter.com/jdfenderbender
facebook.com/jdjarrell