I've only been able to test this in Mac OS 10.4.11, but it may be worth a try...
Using a keyboard shortcut program such as
Spark, assign a hot key to run the following AppleScript:
Code:
tell application "Finder" to activate
try
tell application "System Events"
tell 1st UI element of group 3 of tool bar 1 of window 1 of process "Finder"
perform action "AXPress"
end tell
end tell
end try
Make sure that "Enable access for assistive devices" is checked in System Preferences > Universal Access. Good luck.