Check of online status of my websites

I own several websites. To ensure a continuing uptime performance, I am lookoing a guy who can build a really small checking tool whether the website can be reached or not. - Domains that shall be checked are saved in a database - Script checks online-status of domains every x minutes (can be done via cronjob) - in case some domains are not reachable, an email is sent to two predefined mail adresses, including the domain names that couldnt be reached. Small job and the chance to get some good reference.