I should note that the web service is not on the internet, so you can't test with it. It's just an example of how I did it.
One idea is to first open the page and use the info you want to collect. This should produce the url in the address line that contains all the code needed to open that page. Test this by clicking into the address field and it will highlight and copy the url. Test it by opening a new tab and pasting that info into the tab and press enter. This should result in the same page, etc. being displayed.
Now create your script and in the open url dialog paste the same url info into it. Now when you run the script it should open the exact page you want and show the current info.
Hope this helps.