Modification to close button with facebook hidden like

Hello to all, I am using this plugin to my website : [login to view URL] I need someone to modify it so when the user press "X" button to close it i need to press like to a facebook fan page. i need an extra field to plugins back end to setup the fanpage url and another option to activate and deactivate this future. and close button works normal as close button. If it's active and user press "X" button to close the popup i need the like and after this close the popup and feed user's browser with the normal plugins cookie. I Will pay max 20 dollars for this