Javascript (Nodejs + Backbone) Error in Internet Explorer

The web page is working fine in Chrome and Firefox browser but in IE 7,8,9 the same script is refreshing and loading again and again as if some infinite loop is running.

The web page is created using node and backbone. Could not understand what is going on?

Can someone help me on this? This is the core script on my web page.

<script type="text/javascript">

require.config({
  baseUrl: 'http://127.0.0.1:3000/js/'
  , urlArgs: "bust="+(new Date()).getTime()
  , paths: {
    "sys": "sys"
    , "models": "models"
    , "collections": "collections"
    , "views": "views"
    , "ui": "views/ui"
    , "routes": "routes"
    , "libs": "libs"
    , "config": "config"
    , "templates": "../templates"
  }
});

require(['app'], function(App) {
  new App();  

  Backbone.history.start({pushState: true});
});

</script>