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$/100)$