rem: iframe.parentNode.removeChild(iframe); iframe = null; 
add: if (iframe != null) { iframe.parentNode.removeChild(iframe); iframe = null; } 
context: function dwrHandleError(reason){    iframe.parentNode.removeChild(iframe);    iframe = null;    if (postHook != null)    {        postHook();    }    if (errorHandler != null)    {        errorHandler(reason);    }}
meta: 266	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/266/8a792f58b53fa8fed2e5c9f128e6ae723c501da3/engine.js/buggy/java/uk/ltd/getahead/dwr/engine.js