title: Possible cases for Javascript error: "Expected identifier, string or number"
body: <p>Some users are reporting occasional JS errors on my site. The error message says "Expected identifier, string or number" and the line number is 423725915, which is just an arbitrary number and changes for each report when this occurs. 
  This mostly happens with IE7/ Mozilla 4.0 browsers.</p>
  
  <p>I scanned my code a bunch of times and ran jslint but it didn't pick anything up - anyone know of the general type of JS problems that lead to this error message?</p>