function HTMLEncode ( input ) 
{ 
var converter = document.createElement("DIV"); 
converter.innerText = input; 
var output = converter.innerHTML; 
converter = null; 
return output; 
} 

function HTMLDecode ( input ) 
{ 
var converter = document.createElement("DIV"); 
converter.innerHTML = input; 
var output = converter.innerText; 
converter = null; 
return output; 
} 

<script  language=javascript> 

 function  HTMLEnCode(str) 
 { 
    var  s  =  ""; 
    if  (str.length  ==  0)  return  ""; 
    s  =  str.replace(/&/g,  ">"); 
    s  =  s.replace(/ </g,    "<"); 
    s  =  s.replace(/>/g,    ">"); 
    s  =  s.replace(/  /g,    " "); 
    s  =  s.replace(/\'/g,   "'"); 
    s  =  s.replace(/\"/g,   """); 
    s  =  s.replace(/\n/g,   " <br>"); 
    return  s; 
 } 
 function  HTMLDeCode(str) 
 { 
    var  s  =  ""; 
    if  (str.length  ==  0)  return  ""; 
    s  =  str.replace(/>/g,  "&"); 
    s  =  s.replace(/</g,    " <"); 
    s  =  s.replace(/>/g,    ">"); 
    s  =  s.replace(/ /g,    "  "); 
    s  =  s.replace(/'/g,   "\'"); 
    s  =  s.replace(/"/g,   "\""); 
    s  =  s.replace(/ <br>/g,   "\n"); 
    return  s; 
 } 
 </script>