SO - jQuery html(text) parsing via ajax
http://stackoverflow.com/questions/10158944/jquery-htmltext-parsing-via-ajax
HTML
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
JavaScript
$.ajax({
url: '/echo/html/',
data: {
html: '<html><body><p>not needed content</p><p><div id="myDiv">my content</div></p></body></html>'
},
type: 'post',
dataType: 'html',
success: function(r){
var divContent = $(r).filter('#myDiv').html();
document.write(divContent);
}
});