Ínstalling ecommerce google Analytics Code

[M.K.]

Know someone how to instal real transaction tracking from GA (http://code.google.com/intl/cs/apis/analytics/docs/gaJS/gaJSApiEcommerce.html).

I know, that i must put code as

var pageTracker = _gat._getTracker("UA-12345-1");
pageTracker._trackPageview();
pageTracker._addTrans(      "1234", // order ID - required
     "Womens Apparel", // affiliation or store name
     "11.99", // total - required
     "1.29", // tax
     "15.00", // shipping
     "San Jose", // city
     "California", // state or province
     "USA" // country    );
  pageTracker._addItem(
     "1234", // order ID - necessary to associate item with transaction
     "DD44", // SKU/code - required
     "T-Shirt", // product name
     "Olive Medium", // category or variation
     "11.99", // unit price - required
     "1" // quantity - required   );
  pageTracker._trackTrans();

but how to put values there?