[TxMt] browser preview command

[pascal@g]

hi, I'm a bit confuse with the shell command to allow preview HTML  
page with browser instead of Web Preview. I'm not familiar enough with  
Terminal to "experiment".
when I paste:
sh ~/Documents/Scripts/browser.sh
... I go nowhere.
I would greatly appreciate someone's help on that, including the  
command line to get a choice between Safari or Firefox.
--
cheers