forgive the lack of proper wording..

[tairae.livejournal.com]

So, someone out there must be able to understand what I am about to ask.

Knot tying....like the kind of knot that you would put at the end of a necklace (clasp area, but sans clasp) to make it multi sizable (yes, love the technical wording I've got going on). Pretty much two knots so the necklace becomes one continuous loop and you can pull the sides apart to make it smaller or bigger. Can someone please tell me how to do this!? Any help is so very much appreciated. Thanks everyone...