Alias F1 { run http://www.somesite.com }
or
Alias F1 { run "path\to\browser.exe" http://www.somesite.com }

Try puting the alias in one single line each. Also see if the path\to\browser way works. Maybe using the dot (.) in front of the /run command will silent the erro msg? /.run bla bla bla

I've ran out of ideas :P
Good luck,
Zyzzyx smile

"All we are saying is give peace a chance" -- John Lennon