Exercise $1$: Given the following HTML Code: Implement JavaScript OnValueChange$()$ function that will do the following: $$ If the bill amount field is ZERO or Below: Show the alert message "Error: Bill Should be $>0"$ and hide the output div block. $$ If the bill amount contains a valid input, show the output div block and display tip amount and total bill with tip, as shown in the figure below. Note that Total Bill with Tip $=$ Bill Total $+$ Bill Total x $($Tip Amount$/100)$ Exercise $2$: Examine the following HTML Code: The pulldown menu holds customer id in each of its