Submit Button opens New Window of Portal instead of index.html page

Hi,

The code developed in HTML,JSP and JS in NWDS. Its an Order Page. Once you click on Submit button it should submit the data and come back to the same order page. But instead its opening portal page http://(hostname):(port)/irij. In the js code on submission action it is referenced to call OrderPage. I dont know what is wrong. Please Help

Thanks & Regards

Simin