Displaying A Slider Image On Mouseover?

I have an imagemap that I am using to collect user ratings (the image is of a gradient, and the more to the right they click, the higher the rating). I want to essentially keep the same functionality with a small addition:

I want a slider image to display under the user's mouse when the user is hovering over the imagemap, and I want it to move horizontall whenever the user's mouse moves over the imagemap. This would make the imagemap look like a slider, except the user would still be able to instantly rate without needing to drag a slider (it would simply follow his/her mouse).

I'm not very familiar with JavaScript, though. If anyone could give me an idea how to write something like this or possibly write some sample code, I would be very grateful. I imagine that something like this is very simple (i.e. just taking the user's horizontal mouse coordinates and overlaying an image), but I really do need help writing it. I don't want to sound lazy, but the project I'm working on has more to do with server-side programming, so it wouldn't be a good idea for me to spend a few days learning all about JavaScript in order to accomplish this small bit of functionality.