Here's two:
This one does what you asked for:
[php]
tell app "Finder" to activate
tell application "System Events"
keystroke "k" using {command down}
end tell
[/php]
This one brings up the old Jaguar connect to server dialog:
[php]
open location (choose URL showing File servers with editable URL)
[/php]
[edit] - grrr. I forgot that The Board mangles long AppleScript URLs