function show_window(m_file)
{
    //var height=(screen.availheight-60);
    //var width=(screen.availwidth-80);

    var height=(screen.availheight-50);
    var width=(screen.availwidth);

    var top=(screen.availheight-height)/2;
    var left=(screen.availwidth-width)/2;
    var ref;
    ref="scrollbars=1,top=" + top + ",left=" + left + ",height=" + height + ",width=" + width

    window.open(m_file,"",ref);
}