Track cursor movement of all the visitors on a website

[Jobt]

I know that there are many analytics tools available to track cursor movement of all the visitors on a website - these tools basically track the movement by giving a javascript code which need to be pasted on the website. They all are quite expensiveI am trying to develop it for my own website - a tracking code installed on my website and the cursor movements viewed on some other page/website.I have seen in google docs wherein if many people open the doc. different cursor are visible in different colors each corresponding to a particular visitor. I want to develop similar functionality for website.I have tried to google but I am not able to find a starting point from where I can start developing it.Please guide me.