Can I use Macbook Pro as a wireless router?
Try this...

Sharing your Internet connection - http://docs.info.apple.com/article.html?path=Mac/10.5/en/8156.html

Your mac will basically create a WiFi network for the iPad to join and then it will share traffic from the ethernet connector/PPPoE/cable.

Your mac's buit in help might be newer than the link I provided, so check there first. Also, be sure you turn off any firewalls if you don't know how or what holes to poke in them. You may be less secure, but it's a bit harder to set up the firewall on one interface and not the other.