Ajax request triggers pop-up blocker. Why?

Is it common for an Ajax post-method request to trigger the browser's popup blocker if the Ajax response handling function submits a form to a target window that does not yet exist?

The Ajax request is directed to the same web server as the original page.

Does anybody have a suggestion for a work-around?

A snippet from the function that makes the request is as follows:

var url ="/SomeServerPage.jsp";

var key = somekey.value;

var parameters ="key=" + key;

ajaxReq.open('POST', url,true);

ajaxReq.setRequestHeader("Content-type","application/x-www-form-urlencoded");

ajaxReq.setRequestHeader("Content-length", parameters.length);

ajaxReq.setRequestHeader("Connection","close");

ajaxReq.send(parameters);

A snippet from the function that deals with the response is as follows:

if (ajaxReq.readyState == 4)

{

if (ajaxReq.status == 200)

{

var entries = ajaxReq.responseXML.getElementsByTagName("entry");

var entry = entries[0];

var FormHtml = entry.getElementsByTagName("formHtml")[0].firstChild.data;

ajaxReq =null;

// Dynamically add the form to the HTML page

var newdiv = document.createElement("div");

document.body.appendChild(newdiv);

newdiv.innerHTML = FormHtml;

// Form name is "myForm"

// target name is "_someTarget"

myForm.submit();

// Dynamically remove the form

document.body.removeChild(document.body.lastChild);

[2101 byte] By [sun3sweeta] at [2007-11-27 2:32:46]