This lua script gives you the ability, to search for selected text or word from cursor in an search engine or on an search site of your choice.You can select the engine/site from a list, that you have defined in your user properties.
To get the right call for your search engine, open the engine and search for one word. You need the url without the searched word. Write to your properties an display name for this engine and, separated by a comma, the url. See my example in the script header.
For the list with search sites, you need display name and site address (without http://).