function makeSublist(parent,child,isSubselectOptional,childVal){
            $("body").append("<select style='display:none' id='"+parent+child+"'></select>");
            $('#'+parent+child).html($("#"+child+" option"));
            var parentValue = $('#'+parent).attr('value');
			if(navigator.userAgent.indexOf("MSIE") != -1){ 
                $('#'+child).html($("#"+parent+child+" .sub_"+parentValue));
			}else{
                $('#'+child).html($("#"+parent+child+" .sub_"+parentValue).clone());
			}
            childVal = (typeof childVal == "undefined")? "" : childVal ;
            $("#"+child+' option[@value="'+ childVal +'"]').attr('selected','selected');
            $('#'+parent).change( 
               function(){
                  var parentValue = $('#'+parent).attr('value');
                  $('#'+child).html($("#"+parent+child+" .sub_"+parentValue).clone());
                  if(isSubselectOptional) $('#'+child).prepend("<option value='none'> -- Select -- </option>");
                  $('#'+child).trigger("change");
                                 $('#'+child).focus();
               }
            );
         }