contents
Option contents is contents of balloon, any HTML string or jQuery object. If an img element has both title and alt property, use title.
$('.sample4-1').balloon({
contents: '<a href="#">Any HTML!</a><br />'
+'<input type="text" size="40" />'
+'<input type="submit" value="Search" />'
});
$('.sample4-2').balloon({ contents: $('h1').clone() });
4-1
4-2