pixivにログインするApplescript

tell application "Safari"
activate
if URL of document 1 starts with "http://www.pixiv.net/" or URL of document 1 starts with "https://www.secure.pixiv.net/" then
do JavaScript "login_pixiv_id.value='pixiv ID'" in document 1
do JavaScript "login_password.value='パスワード'" in document 1
else
display dialog "アドレスが違うよ" buttons {"Yes!", "ウホッ！", "マジで？"} default button 1
end if
end tell