Need ADSL uptime monitoring service

Hi all
My ADSL at home goes offline every now and then and I am hosting my own website on that Server at home.So now every time my internet at home goes off people can’t access my site.I need something that will notify me on my work email address when my internet goes off.So my question is as follows:Is there a service that allows an email to be sent to a email address when the internet goes off?Any answer would be greatly appreciated.Thanks to anyone in advance.