title: How to handle the "a script on this page is causing internet explorer to run slowly" alert?
body: <p>From javascript I'm calling a web method. With IE, if I pass a huge parameter to that web method, an alert "Stop running this sciprt? A script on this page is causing internet explorer to run slowly" pops up.</p>
  
  <p>Is it possible to handle the click on the "Yes" button, so that if the user decides to cancel the script execution I can run some alternative script (in this case, my "alternative" script consists in closing some progress bar I popup just before running the long time script).</p>
  
  <p>I have seen many posts explaining how to prevent this alert from being displayed, but I don't want to stop the alert from being displayed: I just want to be able to handle the case in which the user decides to stop the script execution.</p>