Syntax question '/a-b;'

From	"Joey@still_Learning.invalid" <Joey@still_Learning.invalid>
Newsgroups	comp.lang.javascript
Subject	Syntax question '/a-b;'
Date	2012-04-24 09:50 -0700
Message-ID	<79mdp71k9r37eeeurnhcif3ecfvh9vbbu7@4ax.com> (permalink)

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I'm looking at a js script and I've come across syntax that's foreign in
meaning to me. Could someone explain what

width = width/2-150;

Means? I don't understand what the 2-150 is all about, but when I change
the 150, my 'stuff' renders differently.
-- 
Joey

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Syntax question '/a-b;' "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2012-04-24 09:50 -0700
  Re: Syntax question '/a-b;' "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2012-04-24 19:59 +0300
    Re: Syntax question '/a-b;' "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2012-04-24 11:32 -0700
      Re: Syntax question '/a-b;' Swifty <steve.j.swift@gmail.com> - 2012-04-26 14:56 +0100

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