Quick data entry task

I have a spreadsheet containing 500 web addresses. I need someone to click each of these links and then add "y" to the next column in the spreadsheet if there is a large pink box at the top of the webpage, or "n" if there is no large pink box.

It's very simple and quick. I can do 8 pages in a minute, so it should be doable in 1 hour to 1.5 hours.

I need this to be completed with the next 10 hours.