Prevent type-ability but allow auto-Suggest

Prevent type-ability but allow auto-Suggest

I am currently using  http://code.drewwilson.com/entry/autosuggest-jquery-plugin for Auto-Suggest. I am wondering if we can prevent type-ability into the textbox and at the same time allow auto-Suggest only to be active on it. Otherwise, I am getting strange characters left which might be ambiguous for the users.

If I use a keypress and cancel propagation then even autosuggest is voided. Any clues?

In the screenshot below, I don't want the user to be able to have typed in 'Nithya Lavanya'. 'Vasudevan Deepak' was chosen from the auto-suggest and is fine.