if you use ajax and not "replace" the content in a div, "add" to it
eg. with jQuery, not
$('#convo').html('<p>Msg1</p><p>Msg2</p><p>Msg3</p>');
do
$('#convo').append('<p>Msg1</p>');
$('#convo').append('<p>Msg2</p>');
$('#convo').append('<p>Msg3</p>');
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