<script>
	$(function(){
		$('#submitlink').click(function(){
			$.ajax({
				type: "POST",
				url: "test.php",
				data: $("#myform").serialize(),
				beforeSend: function(){
					$('#result').html("<img src='loading.gif' />")
				}
				success: function(data){
					$('#result').html(data);
				}
			});
		});
	})
</script>

<?php
	if(bedingung){
		//Hier soll dann mein Knopf eingeblendet werden
		echo '<form action="" method="post" onsubmit="return: false;" id="myform"> <a href="#" id="submitlink">Load more!</a><div id="result"></div></form>';
	}
?>