Image selector for cash register page

I need a javascript web page that will display an image with currency (supplied) , the user will then select the different dominations and their value will need to be subtracted from a fixed provided value. This is for a small cash register project for a schools flea-market sale. The user (age 5) need to select items to add in cart - already done- and then go to a screen as detailed above to input the dominations supplied by the clients. The currency image will be provided on request but consist of 10 different "rectangular boxes" used to select the currency. The total budget for this is $20 any takers?