how to set cookies value when keypress in input

how to set cookies value when keypress in input

<script type="text/javascript"src="jquerycookies.js"></script><script type="text/javascript">
 var COOKIE_NAME = 'adqs';
 var options = { path: '/', expires: 10 };
 f = $("#update").val();
 function setCookie(){
  $.cookie(COOKIE_NAME, 'testvmxzcmv', options);
 return false;
 }
 </script>
how to set cookies value when keypress in input
 <input type="text"id="update"onClick="javascript:setCookie()" />