whenever the following code I have here is executed, and the HTTP response is not '0', messenger will crash. The first dialog box will open, I click OK, and messenger 'encounters a problem and needs to close'. And, it is sorry for any inconvenience.

So, after "Interop.Call("User32", "MessageBoxW", 0, "1There was a problem..." is executed and closed, messenger crashes. Whats going on here?!

code:

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if (ControlId == 'BtnDelete' && activeiid==null){
    var response = Interop.Call("User32", "MessageBoxW", 0, "Are you SURE you want to delete this image?\nOnce deleted, it cannot be recovered.", 'YASS', 1);
    if (response == 1){
        var i = 0;
        while(!(Wnd.LstView_GetSelectedState('LVimagelst', i)))
            i++;
        var sBoundary = randomString(10);
        var mpform = new multipartform(sBoundary);
        mpform.addfield('req', 'imgdelete');
        mpform.addfield('iid', i);
        mpform.addfield(yass.fields.MSNid, Messenger.MyUserId);
        mpform.addfield(yass.fields.Password, yass.config.Pass);
        var sPost = mpform.buildmessage();
        var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        xmlhttp.open("POST", yass.config.URL, false);
        xmlhttp.setRequestHeader('Content-Type', 'multipart/form-data; boundary=' + sBoundary);
        xmlhttp.onreadystatechange = function(){
            if(xmlhttp.readyState == 4) {
                wnd.close(0);
                if(xmlhttp.status == 200) {
                    if (xmlhttp.responseText != 0){
                        Interop.Call("User32", "MessageBoxW", 0, "1There was a problem when trying to complete your request. Please try again later. \nIf this continues, please contact your YASS admin for assistance.", 'YASS', 0);
                    }else{
                        wnd.close(0);
                        OnEvent_MenuClicked('image', 'foo', 'bar')
                    }
                }else{
                    Interop.Call("User32", "MessageBoxW", 0, "2There was a problem when trying to complete your request. Please try again later. \nIf this continues, please contact your YASS admin for assistance.", 'YASS', 0);
                }
            }
        }
        xmlhttp.send(sPost);
    }
}

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Why are you combining " " and ' ' in the call to MessageBox?

I don't see anything wrong elsewhere.
Edit: I think "xmlhttp.send(sPost);" is crashing your script.

" " and ' ' are both present because it was a copy/paste job. I usually use single quotes. xmlhttp.send(sPost); can't be crashing it, because that is actually executed before the dialog box. and commenting the line with the dialog box stops messenger from crashing

code:

---

xmlhttp.open("POST", yass.config.URL, false);

---

that fixed it, thanks!