I am not sure how to name/call the text boxes so the user data can be used for a function. Problem below.

Write a program that allows the user to enter an item cost in one textbox and a quantity purchased in a second textbox. When a generic button is clicked the total cost + 6% tax is displayed in a third text box. Your form should look something like the following:in Javascript, Not sure how to call the information that a user puts in to a box in order to roll that in to function.