index.html

<div id="insertTest"></div>

<script>
var wikipediaHTMLResult = function(data) {
    var readData = $('<div>' + data.parse.text.* + '</div>');

    // handle redirects
    var redirect = readData.find('li:contains("REDIRECT") a').text();
    if(redirect != '') {
    	callWikipediaAPI(redirect);
        return;
    }
    
    var box = readData.find('.infobox');
    
    var binomialName    = box.find('.binomial').text();
    var fishName        = box.find('th').first().text();
    var imageURL        = null;

    // Check if page has images
    if(data.parse.images.length >= 1) {
        imageURL        = box.find('img').first().attr('src');
    }
    
    $('#insertTest').append('<div><img src="'+ imageURL + '"/>'+ fishName +' <i>('+ binomialName +')</i></div>');
};

function callWikipediaAPI(wikipediaPage) {
	// http://www.mediawiki.org/wiki/API:Parsing_wikitext#parse
    $.getJSON('http://en.wikipedia.org/w/api.php?action=parse&format=json&callback=?', {page:wikipediaPage, prop:'text|images', uselang:'en'}, wikipediaHTMLResult);
}

callWikipediaAPI('Aholehole');
</script>

jquery formatted.js

$.getJSON("http://en.wikipedia.org/w/api.php?action=parse&format=json&callback=?", {page:pageName, prop:"text"}, wikipediaHTMLResult);

jquery images.js

$.getJSON("http://en.wikipedia.org/w/api.php?action=query&format=json&callback=?", {titles:pageName, prop: "images"}, wikipediaImageResult);

jquery source.js

$.getJSON("http://en.wikipedia.org/w/api.php?action=query&format=json&callback=?", {titles:pageName, prop: "revisions", rvprop:"content"}, wikipediaPageResult);