title: Internet explorer hanging issue
body: <p>I'm currently experiencing an intermediate problem with some inherited client side javascript. Every so often the users' experience a browser hang with the cursor becoming an egg timer and then the browser failing to respond. </p>
  
  <p>I'm having real difficulty in determining where the issue is arising from. Short of disabling large chunks of javascript at a time is there any way to detect a hang in internet explorer and then examine the stack trace to determine the last few functions called in order to localise the problem?</p>
  
  <p>Any help with this would be really appreciated. </p>