collections of emails from website/internet

Hi I would like to create a simple program that, collect emails from internet: I would like to define the program from where to collect the email: For example: to be able to enter the program the site: [login to view URL] and than the program will scan the site and collect all possible emails: [login to view URL] and than to enter each page and to collect the emails from the right hand side. Also another option that this "spider" will do : For example : On [login to view URL] And than to go to (etc) Maine: [login to view URL] The program will enter those web sites and collect all possible email from the site. The will have the option to export all data in: txt, XML or excel sheet. If you have any other suggestions, please let me know. Thank you Dan