Make a seesaw calculator!

Ask for input about
	+1 Left hand kid's distance from the pivot
	+1 Left hand kid's weight
	+1 Right hand kid's distance from the pivot
	+1 Right hand kid's weight
	+1 Use a number type input

Check all inputs for validity.  
	+1 No kid weighs less than 6 lbs.
	+1 No kid weighs more than 400 lbs.
	+1 No kid has a negative distance.
	+1 The seesaw is only 20 feet long (10 feet each side of center)

If some input is wrong, 
	+1 turn it red
	+1 set it to blank

Compute which way it balances
	Could be left
	Could be right
	Could be equal

Show the answer
	+2 Fill in a div/span to say the answer
	+2 Change the background to tilt left/right (show a picture)

Other Stuff
	+1 Embed a seesaw video
	+1 Play seesaw music in the background

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Make a change calculator

Ask for input about
	+1 How many pennies
	+1 How many nickels
	+1 How many quarters
	+1 How many dollars
	+1 Use a number type input

Check all inputs for validity.  
	+1 No one has negative things.
	+1 No more than 10 pennies.
	+1 No more than 20 dollars.
	+1 No more than 5 other things

If some input is wrong, 
	+1 turn it red
	+1 pop up an alert box

Compute the total amount of $$$

Show the answer
	+2 Fill in a input to say the answer
	+2 Change some picture (but not the background) depending if they have more than $0.99

Other Stuff
	+2 Have a background that is a gradient (see w3schools gradient stuff)
	-OR-
	+2 Have a list with three links to money stuff, with roman letters