// set your AFFILIATE IDs here. Leave blank any you do not have an account for.
var arrAffiliates = {
    'co.uk' : '',
    'com'   : '',
    'de'    : '',
    'fr'    : '',
    'ca'    : '',
    'jp'    : ''
}

/**
 * search for any AMAZON product links and replace with a referral link to the user's local Amazon site
 * @author Pete Williams
 * @url http://petewilliams.info/blog/2009/07/javascript-amazon-associate-link-localiser/
 */
function checkAmazonLinks() {

    // set required VARIABLES
    var strTld;
    var objRegexAsin    = new RegExp( '\/([A-Z0-9]{10})' );

    if ( typeof google != "undefined" && google.loader.ClientLocation != null ) {
        var strCountry      = google.loader.ClientLocation.address.country_code;

        // get domain TLD from country code
        switch ( strCountry ) {
            case 'GB':
            case 'IE':
                strTld = 'co.uk';
                break;
            case 'AT':
                strTld = 'de';
            default:
                // by default, TLD is lowercase of country code. if no associate, then use .com
                strTld = ( arrAffiliates[strCountry.toLowerCase()] ? strCountry.toLowerCase() : 'com' );
                break;
        }

        strAffiliateId = getAffiliateId( strTld );

    }

    // get all LINKS
    var arrLinks = document.getElementsByTagName( 'a' );

    // LOOP through
    for ( i=0; i<arrLinks.length; i++ ) {

        // is it an AMAZON link
        var intIndex = arrLinks[i].href.toLowerCase().indexOf( 'amazon.' );

        if ( intIndex > 0) {

            // find ASIN
            var arrResults = objRegexAsin.exec( arrLinks[i].href );

            if ( arrResults ) {
                // REPLACE URI
                var strAsin = arrResults[1];

// check location has worked
                if ( typeof(strAffiliateId) == "undefined" ) {
                    strTldToUse         = getOriginalTld( arrLinks[i].href );
                    strAffiliateIdToUse = getAffiliateId( strTldToUse );
                } else {
                    strTldToUse     = strTld;
                    strAffiliateIdToUse = strAffiliateId;
                }

                arrLinks[i].href  = 'http://www.amazon.' + strTldToUse + '/exec/obidos/ASIN/' + strAsin + '/' + strAffiliateIdToUse;
            }


        }
    }
}

function getAffiliateId( strTLD ) {
    return( arrAffiliates[strTLD] ? arrAffiliates[strTLD] : arrAffiliatesSpares[strTLD] );
}

function getOriginalTld( strUrl ) {
    var c = new RegExp( "amazon.(.*?)/" );
    arrTldActual = c.exec( strUrl );

    return arrTldActual[1];
}

// initialise on page LOAD
if (window.addEventListener){
    window.addEventListener('load',checkAmazonLinks,false); //W3C
} else{
    window.attachEvent('onload',checkAmazonLinks); //IE
}

// these are the author's affiliate IDs. They will only be used for localities you do not provide an ID for.
var arrAffiliatesSpares = {
    'co.uk' : 'pcrev05',
    'com'   : 'petewill-20',
    'de'    : 'petewill05-21',
    'fr'    : 'petewill-21',
    'ca'    : 'petewill00-20',
    'jp'    : 'petewill-22'
}