5.3 Develop and test an HTML document that has checkboxes for apple (59 cents each), orange (49 cents each), and banana (39 cents each), along with a Submit button. Each of the checkboxes should have its own onclick event handler. These handlers must add the cost of their fruit to a total cost. An event handler for the Submit button must produce an alert window with the message Your total cost is $xxx , where xxx is the total cost of the chosen fruit, including 5 percent sales tax. This handler must return false (to avoid actual submission of the form data).

5.4 Develop and test an HTML document that is similar to that of Exercise 5.3. In this case, use text boxes rather than checkboxes. These text boxes take a number, which is the purchased number of the particular fruit. The rest of the document should behave exactly like that of Exercise 5.3.

5.5 Add reality checks to the text boxes of the document in Exercise 5.4. The checks on the text box inputs should ensure that the input values are numbers in the range from 0 to 99.

5.6 Range checks for element inputs can be represented as new properties of the object that represents the element. Modify the document in Exercise 5.5 to add a max property value of 99 and a min property value of 0. Your event handler must use the properties for the range checks on values input through the text boxes.