tell application "Terminal"
activate
do script "ping google.com" in front window
my makeTab()
do script "ping yahoo.com" in front window
my makeTab()
do script "ping msn.com" in front window
end tell
on makeTab()
tell application "System Events" to keystroke "t" using {command down}
delay 0.2
end makeTab
tell application "Terminal"
do script "echo Hello World!"
end tell