Technically speaking, 'top' would be in the same window, overwriting the top level page in the window. I think that is what is happening because with Ajax, there is usually only the one page. If it were 'new' that generally means in a new window. If you wanted it to open in the content division, that might be able to be done if your form's method is get (the default) by using the form's onsubmit attribute and targeting the login page to the content division. Something like:
Code:
<form action="loginpage's URL" onsubmit="ajaxpage(this.action+whatever parameters the form is passing if any, 'contentarea');return false;">
Bookmarks