bookmark to generate amazon affiliate links

amazon-affiliate-bookmark

javascript:
var affiliateId = "YOUR_AFFILIATE_ID";
var l = window.location.href;
var urlPieces = l.split("/");

var productId = getProductId("dp");
if (!productId){
    productId = getProductId("product");
}

if (productId){
    var newurl = "http://www.amazon.com/dp/" + productId + "/?tag=" + affiliateId;
    alert(newurl);
}

function getProductId(prevKey){
    for (var i = 0; i < urlPieces.length - 1; i++){
        if (urlPieces[i].toLowerCase() == prevKey){
            return urlPieces[i + 1];
        }
    }
}