ajax error with javascript -

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i using following function has worked fine until now, getting following error:

[exception... "component returned failure code: 0x80004005 (ns_error_failure) [nsixmlhttprequest.send]" nsresult: "0x80004005 (ns_error_failure)" location: "js frame :: http://www.myurl.info/manage/sharedlibrary.js :: getfile :: line 406" data: no]

note error line indicated below directly after comment in code block.

additional research apparently common issue firefox. have cleaner way [this]?1

the function has worked until , follows:

function getfile(url){     var ajax = null;     try{         if(window.xmlhttprequest){             ajax = new xmlhttprequest();         }else{             ajax = new activexobject("microsoft.xmlhttp");         }         if(ajax){             ajax.open("get", url, false);             //the line below line 406 in error code.             ajax.send(null);             return ajax.responsetext;         }else{             return false;         }     }catch(err){         var = prompt("", err);     } }

i using firefow browser. if crash firefox , relaunch error no longer present yet resurface after bit of time. use case not totally precise.

is there variable should resetting each request?

if try , catch, error seems break underlying functionality not reset until browser relaunched.

any appreciated!

try 

ajax.onreadystatechange = function(){ var text = ajax.responsetext};

before 

ajax.send(null);

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