$('#containerDiv').html($('#txtHTML').val());
alert($('#containerDiv').html());
$('#containerDiv2').append('<div>Appended Div</div>');
$('#containerDiv2').prepend('<div>Prepended Div</div>');
$('#containerDiv3').after('<div>New Div</div>');
$('#containerDiv3').before('<div>New Div</div>');