   <!--
     if(isLayers) {
        document.write('<td><img name="pos1" id="pos1" src="images/empty.gif" alt="" width="200" height=1"></td>');
        document.write('<td><img name="pos1_slit" id="pos1_slit" src="images/empty.gif" alt="" width="250" height=1"></td>');
        document.write('<input type="hidden" name="filter2" id="filter2" value="">');
     } else {     //isAll and isID
        var strn = '<span id="obj_filter2"><select name="filter2" id="filter2" onChange="changeFilterValue(); changeUsbUnits()">' +
                   '<option value="NONE">Ignore</option>' +
                   '<option value="30.6" selected>30.6 um</option>' +
                   '<option value="38.0">38.0 um</option></select></span>';
        document.write(strn);
     }
  //-->
