TinyMCE have some Ajax features. Could it be possible to send the quote there?
Here is some load call in tinyMCE
function ajaxLoad() {
var ed = tinyMCE.get('content');
// Do you ajax call here, window.setTimeout fakes ajax call
ed.setProgressState(1); // Show progress
window.setTimeout(function() {
ed.setProgressState(0); // Hide progress
ed.setContent('');
}, 3000);
}