var addHtml="<span class='text_red'>*</span>";
function req(re){
 if(re.parent("td").find("span").length==0){
  re.attr("require", "true");
  re.parent("td").append(addHtml);
 }
};
function notreq(re){
 re.attr("require", "false");
 re.parent("td").find("span").remove();
};

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