I have a flash map of the UK which is divided up into the counties, a user clicks on a county and is then directed to a new url, eg. www.mydomain.co.uk/region/london. The flash map remains on that new page in case they wish to select a new region.
What I want to know: is it possible to manipulate the flash so that if the url is www.mydomain.co.uk/region/london then london remains highlighted on the flash map. I presume I will have to use some AS which is fine as long as it is AS3.
I'm not sure how familiar you are with writing your own AS3 scripts. The method I would use in this case is to fetch the URL of your browser, and to parse the location out of it.
See related question: How can my Flash app determine its own URL?
Alternatively you can have the individual county pages pass a variable to the Flash movie in the embed/object tag via the HTML.