possible bug in XMLHttpRequest

[jose antonio]

Hello,
I am trying to get remote XML with XMLHttpRequest. my source code is:

function load() {
var req = new XMLHttpRequest();
req.open("GET","http://www.foo.com/anxml.xml",false);
req.setRequestHeader('content-type','text/xml');
req.onload = function() {
alert("received");
}
req.send(null);

}

it works, but When I execute the function load more than once, the memory used by mozilla grows exactly the size of the document I am requesting. For example:

first time: 22.4 mb;
second time: 23.4 mb;
third time: 24.4 mb;

when the file size is 1mb;

But, if I initialize the req object like a global variable, the memory is always the same.

I don't understand why the memory is being increased. The object would be destroyed every time the function load finishes. Or it would not?

Is it a bug? Is it correct?

Thanks.