Flash button that links to PDF

Question

Hi Guys,

I'm trying to create a button in Flash CS4 with Actionscript3 that links to a PDF file but when I publish the link just takes me to www.example.com

I have other links that are working to external sites just this PDF button doesn't work, any ideas would most appreciated.

Here is my code.

var pdfURL:URLRequest = new URLRequest("http://www.arrowecs.co.uk/downloads/SecuringVirtualizedDatacenters_ebook.pdf");


//PDF Link
function pdfLink(event:MouseEvent):void {
    navigateToURL(pdfURL,"_self");
}

download_btn.addEventListener(MouseEvent.CLICK, pdfLink);

Thanks

Giles