[thelist] check existence of a javascript function

[Andrew Clover]

> 2) if (!opener.getAppId) {
>         //do something else
>     } else {
>         appId = opener.getAppId();
>     }

This version is correct and should work as long as there actually is an
'opener' window. To be safe you could also check that the window was indeed
opened by JavaScript first:

  if ((opener) ? opener.getAppId : false)
    appId= opener.getAppId();
  else {
    // do something else
  }

-- 
Andrew Clover
mailto:and at doxdesk.com
http://and.doxdesk.com/