跟踪通过Javascript Cookie点击的链接

I have three pages on my website, when a button is clicked on the first page it directs the user to the second. When at the second page the user has the choice weather to choose to add the 'addon' to their order or skip it. Weather they add or skip the 'addon' They then move onto another page which offers the same thing but a different 'addon'.I have three pages on my website, when a button