function addFields(form) {

var strCents = prompt("Please enter the number of cents", "Type number here");
var cents = parseInt(strCents);
var quarters = Math.floor(cents / 25);
var dimes = Math.floor((cents % 25) / 10);
var nickels = Math.floor(((cents % 25) % 10) / 5);
var pennies = cents % 5;
alert(cents + " cents is comprised of:\n" + quarters + " quarter(s)\n" + dimes + " dime(s)\n" + nickels + " nickel(s)\n" + pennies + " pennies\n");

}

Here's what I have, model dollars on pennies, dimes