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Finding text with JavaScript

<script>
  function find_text(txt) {
    var rng = document.body.createTextRange()
    if (rng.findText(txt)) {
      rng.select();
    }
  }
</script>

</head>
<body>

  <form>
    <input type   ='text' 
           name   ='search_term'>
    <input type   ='button' 
           value  ='Search' 
           onClick='javascript:find_text(search_term.value);'>
  </form>

  some text here...