This is because you are using a dynamically named form element.
Apply iRite with a form element that doesn't have code in its name.
Your irite field is currently named: news_form_textinfo_".$cnt2
and iRite does not create the include properly for dynamically named form elements since it doesn't know what the name might be as it is created dynamically.
Use iRite on another page to create the correct .xml file. Then change the reference on this page to go to that xml file instead of a dynamic one.
In the end your code will look like:
FCKConfig.StylesXmlPath = '../custom/xmlFileFromYourApplicationOnAnotherPage.xml';