[Javascript] IE, Firefox, and XMLHTTPRequest

[matt.murphy at thermofisher.com (Matt Murphy)]

So, I'm a bit of a javascript n00b. I've got a script that uses
XMLHTTPRequest, though that part I did not write. (contributed with
permission) The firefox version works fine with the sample data I'm
using, but the IE version fails if the input string is too long. 
 
here is the XMLHTTPRequest part: 
 
function ajaxme(url)
{
 
        http_request = false;
 
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new
ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }
 
        if (!http_request) {
            alert('Giving up :( Cannot create an XMLHTTP instance. Your
browser may be too old for this application.');
            return false;
        }
        http_request.onreadystatechange = hitMe;
        http_request.open('POST', url, true);
        http_request.send(null);
    }
 
and this is how I call it in my page:
 
ajaxme('notes.php?action=insnotedb&table='+tablename+'&note='+note+'&con
n='+conn+'&datefield='+datefield+'&connid='+connid+'&data='+escape(data)
);
 
if data is long, IE barfs on this line:
        http_request.open('POST', url, true);
but firefox is fine with long data. 
 
For short stuff (5 paragraphs?) they're both fine.
 
Using a form to POST the same data (4x longer than is barfed on by IE)
works in both browsers. 
 
Is there a limitation to the size of http request IE will accept with
XMLHTTP? Any idea what's going on? 
 
Thanks,
 
Matt
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