MathJax - aligned equations with id or class - html

Question

This is my first post here, so I hope everything is clear enough to understand.
I have a list of equations (written in LaTeX), which are alligned like this:
LaTeX example
With following code:
\begin{array}{rcll}
\textrm{gravitational acceleration} & \qquad g & = & \dfrac{G\cdot M}{R^2} \\
\textrm{gravitational acceleration - latitude}: & \qquad g & = & g_{45} - \dfrac{1}{2}\left(g_{poles}-g_{equator}\right)\cos\left(2\varphi\cdot\dfrac{\pi}{180}\right) \\
\textrm{gravitational acceleration - altitude}: & \qquad g_h & = & \dfrac{G\cdot M}{\left(R + h\right)^2} = g_0 \left(\dfrac{R}{R + h}\right)^2 \\
\textrm{arc length}: & \qquad s & = & r\theta \\
\end{array}
The next thing I want to do is that when I click on an equation I get a dropdown with more information or that I go to a page with information of that equation.
But to do this, I think I need some kind of ID of the equation to know which one is clicked and needs extra information.
I hope everything is clear and thanks in advance.