toggle app frontmost with applescript

toggle_frontmost.scpt

on alfred_script(q)
--todo: Record the last open position
set appName to "Finder"
set startIt to false
tell application "System Events"
  if not (exists process appName) then
		set startIt to true
	else if frontmost of process appName then
		set visible of process appName to false
	else
		set frontmost of process appName to true
	end if
end tell
if startIt then
	tell application appName to activate
end if
end alfred_script