Download and Redirect Script

Avg Bid (USD)
Project Budget (USD)
$30 - $50

Project Description:
I require a simple script to do the following:

1. Detect the OS the visitor is using
2. The type of browser the visitor is using
3. Allow the visitor do download a file specific to there OS and Browser when the download button on the site is clicked.
4. After the download button is clicked the visitor should be taken to a next page or website automatically

Here is a site demonstrating the process I am speaking about:

Notice that on that demo site when you click the download button the download file starts and then the visitor is taken to another page

Skills required:
HTML5, Javascript, PHP, Website Design
About the employer:
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