JQuery tooltip Example with image

HTML

<script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>

<img src="http://www.abril.com.br/imagem/jolie-teen-03.jpg" alt="Test" width="100" height="100" title="">    
    <a href="">
</a>

JavaScript

if($.fn.tooltip)
    alert('Contem tooltip');
else
    alert('Não contem tooltip');

$(document).tooltip({
    'content' : 
       function(){
           return '<img width="400" height="400" src="http://quando.saas01.us/img/logo.png" />';
       },
    'position' : {
        'using' : function(){
           $(this).css('width', '500px')
        }
    }
});