Hello, and welcome to PHPBuilder! In the future, please don't cross-post the same topic across multiple forums.
As for your question, let me first ask you... do you have explicit permission to copy this data from the owner/operator of the site in question?
If you do, you'll probably be given some sort of suggestion as to how you should get the data from them. If they planned for this scenario, then they most likely have some sort of XML/RSS feed, SOAP interface, etc. that you can use to easily retrieve and parse the data you need. Otherwise, you'd have to resort to what is commonly referred to as "screen scraping", or retrieving the HTML data that your browser would have parsed into the page you see. You can then use either [man]DOM[/man] or, at the very worst, [man]PCRE[/man] expression-matching functions in order to find and extract the piece of data you need from the HTML code.
If you don't have permission... well, then there's no point in even worrying about how to do this, is there? :p