Display Message

        
<!doctype html>
<html>
   <head>
       <title>Display Message</TITLE>
   </head>
   <body>
     <h1>Display Message</h1>
       <form name="f1">
           Enter Your Age<input type="number" name="nage"><br>
           <input type="submit" value="Display Message" onClick="display()">
       </form>
    </body>
    <script language="Javascript">
          function display()
          {
              event.preventDefault();
              var age;
              age=f1.nage.value;
              if(age>20)
              document.writeln("Hello........");
              else
              document.writeln("Age is not greater than 20");
          }
     </script>
</html>
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