Ajax replace instead of append

you could empty the element before you append

$("#results").empty().append(myHtml);

or use the html method

$("#results").html(myHtml)

jquery ajax replace append

Just change

$('#results').append(myHtml);

$('#results').html(myHtml);

jquery ajax replace append

ok, last entry 2009, but if the problem still exist:
$("#results").replaceWith(yourContent)

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