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There are 2 previous versions of this script.

// ==UserScript==
// @name           Preistrend Versandaddierer 0.1.2
// @namespace      sc8
// @include        http://www.preistrend.de/Preisvergleich_*.html
// @include        http://www.preistrend.de/preisvergleich.php?*
// ==/UserScript==

var preise = document.evaluate("/html/body/table[2]/tbody/tr[2]/td[2]/div/table[2]/tbody/tr[*]/td[3]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
var versande = document.evaluate("/html/body/table[2]/tbody/tr[2]/td[2]/div/table[2]/tbody/tr[*]/td[4]/a", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

if (versande.snapshotLength == 0) {
	preise = document.evaluate("/html/body/table[2]/tbody/tr[2]/td[2]/div/table[3]/tbody/tr[*]/td[3]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
	versande = document.evaluate("/html/body/table[2]/tbody/tr[2]/td[2]/div/table[3]/tbody/tr[*]/td[4]/a", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
}

var alertText = "";
var preis = 0;
var versand = 0;
for (var i = preise.snapshotLength - 1; i >= 0; --i) {
  preis = parseFloat(preise.snapshotItem(i).firstChild.data.replace(/^(.*) (EUR|Euro)$/,"$1"))
  versand = versande.snapshotItem(i).firstChild.data
  if (versand == "siehe Shop") {
    preise.snapshotItem(i).firstChild.data = versand
  } else if (versand == "frei!") {
    // Versand muss nicht hinzuaddiert werden.
    preise.snapshotItem(i).firstChild.data = preis + " €"
  } else {
    versand = parseFloat(versand.replace(/^ab (.*) (EUR|Euro)$/,"$1"))
    preise.snapshotItem(i).firstChild.data = ((preis + versand).toFixed(2)) + " €"
  }
  versande.snapshotItem(i).firstChild.data = "(inkl.)"
}