Better load this script on load_finish, not load_commit.
uzbl_wiki_login_buttons = document.getElementsByClassName('button')
if (uzbl_wiki_login_buttons.length) {
Uzbl.run("spawn /home/raskin/.local/share/uzbl/scripts/formfiller.sh load");
if (uzbl_wiki_login_buttons[7].value == "Login") {
setTimeout(function() {
uzbl_wiki_login_buttons[7].click();
}, 300);
} else if (uzbl_wiki_login_buttons[12].value == "Login") {
uzbl_wiki_login_buttons[12].click();
}
}