Use image map area tag with Greybox

I hope to combine the GreyBox plugin with the Image Map plugin for FCKeditor. (I have updated the js in the Image Map plugin, so it creates a class field in which I can input "greybox.")

However, an image map creates an <area> tag for the href rather than an <a> tag, which doesn't work with GreyBox. How can I manipulate the GreyBox module so this works? I'm guessing I need to get into greybox.js, but I'm not a js expert, so I've hit a bit of a roadblock. Any assistance would be greatly appreciated.