references: 
http://www.w3.org/TR/SVG/script.html#ScriptElement
http://www.ietf.org/rfc/rfc4329.txt
<quot>
   This document defines equivalent processing requirements for the
   types text/javascript, text/ecmascript, and application/javascript.
   Use of and support for the media type application/ecmascript is
   considerably less widespread than for other media types defined in
   this document.  Using that to its advantage, this document defines
   stricter processing rules for this type to foster more interoperable
   processing.
</quot>

work:
<svg id="fooSvg" width="640" height="480" xmlns="http://www.w3.org/2000/svg">
  <script type="text/javascript">
    function bar() {
      //svg related stuff here
    }
  </script>
  <g>
     <title>Foo</title>
     <circle fill="#ff0000" stroke="#000000" stroke-width="5" r="10" cy="10" cx="10" id="fooCircle" />
  </g>
</svg>

does not work:
<svg id="fooSvg" width="640" height="480" xmlns="http://www.w3.org/2000/svg">
  <script type="application/ecmascript">
    function bar() {
      //svg related stuff here
    }
  </script>
  <g>
     <title>Foo</title>
     <circle fill="#ff0000" stroke="#000000" stroke-width="5" r="10" cy="10" cx="10" id="fooCircle" />
  </g>
</svg>