Using models with Scriptaculous's AJAX

[eluser]tokyotech[/eluser]
What is the correct URL if I don't have the index.php shortcut thing?

Code:

// javascript
new Ajax.InPlaceEditor('myTitle', '/index.php/ajax/saveInfo/title');

Code:

// in controllers/ajax.php
function saveInfo()
{
   echo 'testing: it has been saved';
}

After saving the form input field, this dumped my entire WAMP homepage into the field.