Creating a button in flash to open pdf file

i’ve created a button in flash which when clicked i want a pdf order form to pop up. I have set the actions to read as follows:

on (release) {
getURL(“http//www.domainname.co.uk/order_form.pdf”, “_blank”);
}

But after uploading and clicking on the button I get the following error message:
Error 404: /http/www.domainname/order_form.pdf is not found at this location