You can also try this. It won't launch your "default" browser but maybe
this will work for you.
ExplorerExe = 'C:\program files\internet explorer\iexplore.exe'
declare ShellExecute IN shell32.dll;
Integer, String,String, String, String, Integer
ShellExecute(0,"open",ExplorerExe,"
www.ebay.com","",1)