We've just overhauled our registration process on our site. When a user registers they are directed to a pop up / light box as opposed to a unique url.Tracking the conversion funnel was super easy until this change, as goals where assigned through the various entrance and exist points. Is it possible to somehow track say for example, how many times the light box was closed (ie user does not want to register), or how long the user was on the lightbox? I imagine this would be a case of custom .js script? Essentially I need this info to pull into Google Analytics. Any ideas? 
How do I track a pop up in Google Analytics / Tag Manager or Custom JS script
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