PS: DONOT bid over $20 as it will be rejected
You can code it in Java, .NET, PHP or make firefox/chrome browser addon/plugin/extension
Simply write a program that can refresh a list of URLs for every x seconds before moving on to the next url.
For E.g: A list of 10 URLs,
plugin/program refreshes URL1 for 10 times and then moves to URL2 and so on and stops refreshing till it completes the last URL in the list.
2 freelancers are bidding on average $23 for this job
I write a java swing project which will ask you to write the url list. At the time you provide those url as input, it will start opening those web sites and refresh 10 times for each url.