title: myfaces+ajax+IE - problems on page loading
body: <p>After I added f:ajax tag to one of my pages, tomcat automatically inserted jsf.js script into header:</p>
  
  <pre><code>&lt;script type="text/javascript" src="&lt;app-name&gt;/javax.faces.resource/jsf.js.jsf?ln=javax.faces&amp;amp;stage=Development"&gt;
  </code></pre>
  
  <p>it started causing some weird errors in IE on page loading. Most amazing is that each time page is reloaded the number of errors and places they occurred may differ, sometimes significantly. Should I mention that in Chrome everything loads without any problems?</p>
  
  <pre><code>    SCRIPT5007: Unable to get value of the property '_mfClazz': object is null or undefined 
  jsf.js.jsf?ln=javax.faces&amp;stage=Development, line 734 character 13
  SCRIPT5009: '_MF_OBJECT' is undefined 
  _HtmlStripper.js.jsf?ln=org.apache.myfaces.core.impl.util, line 28 character 1
  SCRIPT5009: '_MF_OBJECT' is undefined 
  _AjaxUtils.js.jsf?ln=org.apache.myfaces.core.impl.xhrCore, line 27 character 1
  SCRIPT5007: Unable to get value of the property 'engine': object is null or undefined 
  Xhr1.js.jsf?ln=org.apache.myfaces.core.impl.xhrCore, line 29 character 1
  SCRIPT5009: '_MF_OBJECT' is undefined 
  _Queue.js.jsf?ln=org.apache.myfaces.core.impl.util, line 25 character 1
  SCRIPT5007: Unable to get value of the property '_mfClazz': object is null or undefined 
  jsf.js.jsf?ln=javax.faces&amp;stage=Development, line 720 character 15
  SCRIPT5007: Unable to get value of the property '_mfClazz': object is null or undefined 
  jsf.js.jsf?ln=javax.faces&amp;stage=Development, line 720 character 15
  SCRIPT5007: Unable to get value of the property 'engine': object is null or undefined 
  IFrame.js.jsf?ln=org.apache.myfaces.core.impl.xhrCore, line 27 character 1
  SCRIPT5009: '_MF_OBJECT' is undefined 
  _AjaxRequest.js.jsf?ln=org.apache.myfaces.core.impl.xhrCore, line 32 character 1
  SCRIPT5009: '_MF_OBJECT' is undefined 
  _AjaxResponse.js.jsf?ln=org.apache.myfaces.core.impl.xhrCore, line 32 character 1
  </code></pre>