How to write this flash Action script

Hi dp members,
How can i write this in Flash Action script.

// pseudo code

if (working domain == "mydomain.com"){
     play();
}else {
     gotoAndStop(500);
}

Code (markup):

Taking time would be greatly appreciated.

 

Hope this helps =]

if(_url == "http://location.to/your/flash/file.swf")
    play();
else
    gotoAndStop(500);

Code (markup):

 

This is exactly what it want... thanks girap.