If you just want to specify a subset of destination languages, you can go to http://translate.google.com/translate_tools to setup the code. After you select some specific languages, a parameter "includedLanguages" is added to the Google TranslateElement.
2. Play with Google Translate URL
If you just want to translate your web page or blog into one specific language, there is no point in adding a menu. You can just add a button. For example, if you want to add a button to let the readers translate your web page from English to French, you can add this snippet of code:
<form action="http://www.google.com/translate" onsubmit="this.u.value=window.location.href" method="GET"> <input value="en" name="sl" type="hidden"/> <input value="fr" name="tl" type="hidden"/> <input value="" name="u" type="hidden"/> <input value="FRANÇAIS" type="submit"/> </form>