In some very specific versions of IE7, a javascript bug occours in $.ajax:

"Object doesn't support this property or method"

Line 5234

Character 6

I am using the non-compressed version of jQuery to debug this issue (code.jquery.com jquery-1.4.2.js)

I found a solution and I would update directly on SVN, but as soon I am not very good using SVN systems, I'll publish the solution here so you guys can path this bug in the correct SVN target file

Between the lines 5227 and 5238 reads:

Override the abort handler, if we can (IE doesn't allow it, but that's OK)

Opera doesn't fire onreadystatechange at all on abort

try {

var oldAbort = xhr.abort;

xhr.abort = function() {

if ( xhr && oldAbort.call ) {

oldAbort.call( xhr );

}

onreadystatechange( "abort" );

};

} catch(e) { }

Override the abort handler, if we can (IE doesn't allow it, but that's OK)

Opera doesn't fire onreadystatechange at all on abort

try {

var oldAbort = xhr.abort;

xhr.abort = function() {

if ( xhr ) {

oldAbort.call( xhr );

}

onreadystatechange( "abort" );

};

} catch(e) { }

Must be updated to:

Override the abort handler, if we can (IE doesn't allow it, but that's OK)

Opera doesn't fire onreadystatechange at all on abort

try {

var oldAbort = xhr.abort;

xhr.abort = function() {

if ( xhr && oldAbort.call ) {

oldAbort.call( xhr );

}

onreadystatechange( "abort" );

};

} catch(e) { }

Override the abort handler, if we can (IE doesn't allow it, but that's OK)

Opera doesn't fire onreadystatechange at all on abort

try {

var oldAbort = xhr.abort;

xhr.abort = function() {

if ( xhr && oldAbort.call ) {

oldAbort.call( xhr );

}

onreadystatechange( "abort" );

};

} catch(e) { }

The very small change to address this solution is:

if ( xhr ) {

TO

if ( xhr && oldAbort.call ) {

Feel free to contact me via e-mail with further details

Thank you very much in advance