Bug Check by Jackson

[Jackson-Wen]

Browser: Macbook Safari
\----------------------Harmonic Oscillator-----------------------//

1. Free_Vibration.html: an unfinished project
2. Theory_Forced_Vib.html: Fine
3. Theory_Free_Vib.html: Fine
4. Vibrationspage1.html: Pause button not working
5. Vibrationspage2.html: Pause button not working; reset button not working; the right-nav arrow button not working after changing the sliders;
6. Vibrationspage3.html: basically everything is not working; an unfinished project

\-----------------------Structural Dynamics--------------------//

1. 1Free-Vibrations.html: pause button not working
2. 2Forced-Vibrations.html: reset button not working; pause button not working
3. 3Transient-Vibrations.html: the mathematical expression contains some errors; after starting the animation, the graph disappears if any parameters changed; pause button not working
4. Free_Vibrations.html: basically everything is not working; an unfinished project;
5. rest of the htmls are fine

\------------------------Aircraft Engine------------------------//
Everything is fine

\------------------------Dynamic system copy------------------------//
Everything is fine

\------------------------Turbine nacelle copy------------------------//
Everything is fine

\-----------------------------Vibrations-Lab------------------------//
Everything is fine