Use the _addOrganic() method to add additional search engines to the list. When you do this, you will also specify the query term variable for that search engine, which is commonly a single character or word (such as q or query) used in the query parameter to demarcate the search string. Search engines are added to the list in the order that they are called in your script, or you can set the optional third parameter to true to add the engine to the beginning of the list. You can clear our the entire search engine list by using the _clearOrganic() method, such as if you want to start your search engine list from scratch.