Question about parsing parameters through url

Hello,
I have some questions about parsing parameters through a url.
What I want to build is a page with some text fields and maybe one drop down list. After user enter values into the text fields and select one option in the drop down list, then press the submit button, a report will be opened, which according to the parameters parsed.
These were what I have done:
1. create a blank page and a region
2. create one text field in the region, the name is FIRSTNAME
3. create one hidden items FN, of which the source value is item FIRSTNAME
4. create a process. the type is "Set Preference to value of Item" which set PN with the value of FIRSTNAME when the page submitted
5. create a button "Submit Page and Redirect to URL", in the URL I entered:
http://dianti.local.net:9704/xmlpserver/~shichao/GuestFolder/orderdetail/orderdetail.xdo?_xpf=&_xpt=0&_xdo=%2F~shichao%2FGuestFolder%2Forderdetail%2Forderdetail.xdo&FIRSTNAME=&FN.&_xt=orderdetail&_xf=pdf&_xmode=4
My problem is: it seems working for the first time after I entered a value in the FIRSTNAME text field and press submit button, but when I come back to the page (the report was opened in the same page, wondering how to open it in a new window?), the value is saved in the text field and after I enter another value and submit the page again. It still parse the old value to the report. The value of the parameter doesn't change.
What's the reason? and is this the correct way to build what I want?
Thank you in advance.
Best Regards,
Shichao

Hi Scott,
Thank you again for the help.
But this didn't answer my question exactly. I have tested what you created and the problem remains. When I first time enter a value in the text field and press the button, it goes to page 2, but the parameter didn't parsed. When I go back to page 1 and then click the button again. After that I can see the value I parsed on page 2. Same thing happens when I try to enter a new value. So which means the button has to been pressed twice to parse the parameter.
Due to the limitation of my knowledge of Apex. I don't know how to fix it. Could you please help me again and hope you understand what the problem is. Thank you very much.
Shichao

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