GNOME: How to display an URL in the default webbrowser.

In the past calling

system("nautilus \"http://myhost.de/myurl.html\"";);

did work, but now it with opensuse 10 i only get an error that this is
not a directory.
So what is the preferred way to open an http/file page from a c
program.

As this should popup the initial help page from my program the user
can't configure this at the time it is called (at least i don't want to
force him to do this).

.