From a 3270 Mainframe screen call web site passing data from Mainframe automatically

Currently, our associates use a Mainframe application, but have to stop during the process to get information from the web. They begin to process a transaction, but once they get to a specific screen, they need to retrieve data from the web to determine the next steps. They stop and start a web browser, login to a site, copy and paste the data retrieved from the Mainframe application into the web browser and get the results from the web site. They then continue to process the transaction on the Mainframe. I would like to automate this. From the Mainframe, a PFkey is pressed, that starts a web browser. It would automatically log into the website (generic username and password), pass the specific data from the Mainframe (screen scrape) and show the results from the web browser. Any thoughts would be appreciated!