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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   language="javascript">  
  function   newRow()  
  {  
    var   tbl   =   document.all("mytbl");  
    var   row   = &nb ......

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String.prototype.Trim=function(){
returnthis.replace(/(^\s*)|(\s*$)/g,"");
}
String.prototype.LTrim=function(){
returnthis.replace(/(^\s*)/g,"");
}
String.prototype.RTrim=function(){
returnthis.replace(/(\s*$)/g,"");
} ......
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