textarea 에 특정한 문자 넣기 > PHP

참고 : http://kin.naver.com/qna/detail.nhn?d1id=1&dirId=1040202&docId=71785288&qb=7YGs66Gs7JeQ7IScIHNlbGVjdGlvbi5jcmVhdGVSYW5nZQ==&enc=utf8§ion=kin&rank=3&search_sort=0&spq=0&pid=RVGrnc5Y7tlssZxvcHRsssssssh-088857&sid=Us4rCHJvLDQAADtoE2M



 <SCRIPT type="text/javascript">
 <!--
function $(Element){
  return document.getElementById(Element);
}

function set_tag_support(obj, prefix, postfix) {
  if (document.getSelection)    ts = document.getSelection();
  else if (document.selection)  ts = document.selection.createRange().text;
  else if (window.getSelection) ts = window.getSelection();

  if (ts != ""){ //IE
    document.selection.createRange().text = prefix + ts + postfix;
  }else {
    if (obj.selectionStart == obj.selectionEnd){
    if(/*@cc_on!@*/false){
      obj.focus();
      document.selection.createRange().duplicate().text = prefix + document.selection.createRange().duplicate().text + postfix;
          document.selection.createRange().select();
    }else{
      var s1 = obj.value.substring(0, obj.selectionStart);
      var s2 = obj.value.substring(obj.selectionStart);
      obj.value = s1 + prefix + postfix + s2;
    }
    }else{
      var s1 = obj.value.substring(0, obj.selectionStart);
      var s2 = obj.value.substring(obj.selectionStart, obj.selectionEnd);
      var s3 = obj.value.substring(obj.selectionEnd);
      obj.value = s1 + prefix + s2 + postfix + s3;
    }
  }
  obj.focus();
 }
 //-->
 </SCRIPT>

 <TEXTAREA name="memo" id="memo" ROWS="5" COLS="50"></TEXTAREA>
 <INPUT TYPE="button" onclick="set_tag_support($('memo'), '111', '2222')" value="확인">