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String.prototype.HTMLEncode = function() {
var temp = document.createElement ("div");
(temp.textContent != null) ? (temp.textContent = this) : (temp.innerText = this);
var output = temp.innerHTML;
temp = null;
return output;
}
String.prototype.HTMLDecode = function() {
var temp = document.createElement("div");
temp.innerHTML = this;
var output = temp.innerText || temp.textContent;
temp = null;
return output;
}
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htmlDecode:function(str){
  var temp = document.createElement ("div");
  temp.innerHTML = str;
    var output = temp.innerText || temp.textContent;
    temp=null;
  return output;
 }
htmlEncode:function(str){
  var temp = document.createElement ("div");
  (temp.textContent != null) ? (temp.textContent = str) : (temp.innerText = str); 
  var output = temp.innerHTML;
  temp = null;
  return output; 
 }
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<script type="text/javascript">
   
  function dayChange(year,month,day){
   var selectYear = document.getElementById(year);
   var selectMonth = document.getElementById(month);
   var selectDay = document.getElementById(day);
   va ......
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