Clear default value onFocus

Hi,
We are using version 3.4.2 of this plugin and we need to clear the default field values when the inputs are clicked on. I found this old thread that explains how to do it, but it is for an old version, and the code is no longer applicable:
http://wordpress.org/support/topic/plugin-contact-form-7-erase-fields-onfocus-1

Does anyone have any updated instructions on how to add this functionality?

Thanks,
Colin

http://wordpress.org/extend/plugins/contact-form-7/