Problem facing in using a Servlet with Netscape 8.1 in IE mode.

Hello All,
I am having action as a servlet from my form and method is POST. After the business logic is executed I am doing a getServletContext().getRequestDispatcher(TempSSPJSPPaths.REG_REPORT_EXPORT_EXCEL_JSP)
.include(request,response);
After the dispath happens the doGet() method of my servlet is getting called again and I am having NullPointerException.
Can someone please tell me where the second request comes from as result of which the doget() gets called?
The same thing executes properly in IE and Mozilla Firefox
Message was edited by:
Rajarshi_B

This is how I am submitting the JS Can anyone tell me is there any problem with this code below:
function exportToExcel() {
var formObj = document.summaryForm;     
formObj.action = "<%=helper.encodeUrl(response, "/portal-web/exportTempAccountsServlet")%>";
formObj.target = "_blank";
formObj.submit();
}

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