changes:

9 jan 2012
design layout to usual bottom
A = 0.49 instead of 0.4 previously to make same as lecture notes
add Nodes texts and extra
add Antinodes text and extra
add v = f*lambda assuming speed of sound is 330 m/s
10 Jan 2012
add modeling component through drop-down menu and input field for learners to key in equations to understand the standing waves formed
readjusted position of pipes and everything to start at y = 0 instead of the previous y =0.5 for ease of modeling
add length of pipe for calculation purpose, visualization does not change

enjoy!