Form on PHP page with multiple submits changes CSS of page

[freetreaf]

I've created a PHP web form which when all the data is present has 2 submit buttons (Continue and Print). Continue calculates details based on the entered information and displays it on the page. Print performs the same calculations, but then creates a PDF in a new window.When I click Print the original page still loads (which is fine) but the styling is altered.To see what I mean head to this page and for speed enter "1" in all text boxes except Position (which must be text). After you've clicked Continue, click Print to generate a PDF, then look back at the original web page to see altered styling.Any ideas would be useful.Thanks,Adrian