Textarea tab

Here is example of code that will allow neter tabs into textarea
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Untitled Document</title>
    <script type="text/javascript">
      function setSelectionRange(input, selectionStart, selectionEnd) {
        if (input.setSelectionRange) {
          input.focus()
          input.setSelectionRange(selectionStart, selectionEnd)
        } else if (input.createTextRange) {
          var range = input.createTextRange()
          range.collapse(true)
          range.moveEnd('character', selectionEnd)
          range.moveStart('character', selectionStart)
          range.select()
        }
      }

      function replaceSelection(input, replaceString) {
        if (input.setSelectionRange) {
          var selectionStart = input.selectionStart
          var selectionEnd = input.selectionEnd
          input.value = input.value.substring(0, selectionStart) + replaceString + input.value.substring(selectionEnd)

          if (selectionStart != selectionEnd) {
            setSelectionRange(input, selectionStart, selectionStart + replaceString.length)
          } else {
            setSelectionRange(input, selectionStart + replaceString.length, selectionStart + replaceString.length)
          }
        } else if (document.selection) {
          var range = document.selection.createRange()

          if (range.parentElement() == input) {
            var isCollapsed = range.text == ''
            range.text = replaceString

            if (!isCollapsed) {
              range.moveStart('character', -replaceString.length)
              range.select()
            }
          }
        }
      }

      // We are going to catch the TAB key so that we can use it, Hooray!
      function catchTab(item, e) {
        if (navigator.userAgent.match('Gecko')) {
          c = e.which
        } else {
          c = e.keyCode
        }
        if (c == 9) {
          replaceSelection(item, String.fromCharCode(9))
          setTimeout("document.getElementById('" + item.id + "').focus();", 0)
          return false
        }
      }
    </script>
  </head>
  <body>
    <textarea name="data" id="data" rows="20" columns="35" wrap="off" onkeydown="return catchTab(this,event)"></textarea>
  </body>
</html>