$.arcticmodal({
	type: 'ajax',
	url: 'answer.php',
	ajax: {
	     type: 'POST',
	     cache: false,
	     dataType: 'json',
	     success: function(data, el, responce) {
		var h = $('<div class="box-modal">' +
			      '<div class="box-modal_close arcticmodal-close">закрыть</div>' +
				'<p><b /></p><p />' +
				'</div>');
		$('B', h).html("title");
		$('P:last', h).html("text");
		data.body.html(h);
	      }
         }
});

<div style="display: none;">
  <div class="box-modal">
  		<div class="box-modal_close arcticmodal-close">закрыть</div>
		<p><b></b></p>
		<p></p>
	</div>
</div>

echo "hello";