[Bookmarklet]Automatically TotaPrices on Amazon Offers Page

divsToUpdate = document.getElementsByClassName("olpOffer");
var i = 0;
while (i < divsToUpdate.length){
    var d = divsToUpdate[i];
    var o = d.getElementsByClassName("olpOfferPrice")[0];
    var p = o.innerText;
    //var amountRegex = new RegExp(/[0-9\.]+/ig);
    //console.log("Parent: ",d);
    //console.log("Span  : ",p);
    //console.log("Regex : ",amountRegex.exec(p));
    var amountRegex = new RegExp(/[0-9\.]+/ig);
    var cost = amountRegex.exec(p);
    //console.log("Cost  : ",cost);

    // not all have a shipping price
    var shipping = 0.0;
    var s = d.getElementsByClassName("olpShippingPrice")[0];
    if (s !== undefined) {
        var amountRegex = new RegExp(/[0-9\.]+/ig);
        shipping = amountRegex.exec(s.innerText);
    }
    //console.log(d);
    var c = parseFloat(cost) + parseFloat(shipping);
    //console.log("Actual Price: " + c);

    // now replace the big red price with the ACTUAL price
    o.removeAttribute("class", "a-size-large");
    actualPrice = document.createElement("span");
    actualPrice.className = "a-size-large a-color-price olpOfferPrice a-text-bold";
    actualPrice.innerText = c;
    o.parentElement.insertBefore(actualPrice, o.parentElement.firstChild);

    i++;
}