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Dynamically creating Style Sheets with JavaScript

See insertRule
It seems like IE uses addRule instead of insertRule. 
<html>
<head><title>Dynamically creating style sheets with JavaScript</title>

<script language='javascript'>

  var css = document.createStyleSheet('dyn css', 'projection,tv,screen');

  if (css.insertRule) {
    css.insertRule ('p.blue {color:blue;}');
    css.insertRule ('p.red  {color:red; }');
  }  
  else if (css.addRule) {
    css.addRule('p.red' , 'color:red;' );
    css.addRule('p.blue', 'color:blue;');
  }

</script>

</head>
<body>
  <p class='blue'>This text should be blue

  <p class='red'> This text should be red

</body>
</head>