var dco = new MyWindow(500, 50, 'delete_comments', 'deleteComments', 'dco');

function openDeleteComments()
{
    if(dco.window != 'null') {
        dco.close();
    }
    dco.aj_parameters = $('deleteComments').serialize();
    dco.reload = true;
    dco.open();
}
function deleteComments()
{
    $('deleteComments').submit();
}