<html> 
<body> 
<script language=javascript> 
    function function1() { 
        document.getElementById("myForm").method = "post"; 
    } 
</script> 
<form name="myForm" method="get" action=""> 
<textarea rows="3" cols="200"> 
</textarea> 
</form> 
<input type="button"  
       value='Change the mode of transferring the data to "post"'  
       onclick="function1();"> 
</body> 
</html> 
 
     
       
      
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