Jak zabranit opakovanemu volani ajaxu?

if($('.align_galleryphoto').length){
    $("#id_gallery").change(function(){
	var id_gallery = $('#id_gallery').val();
	var id_module = $('#id_module').val();
	var userid = $('#userid').val();
	var modulePath = $('#modulePath').val();
	var activeModulePath = $('#activeModulePath').val();
	var language = $('#id_language').val();
	var root = $('#root').val();
	var webmaker = $('#webmaker').val();

	$.post('../ajax/align_galleryphoto.php', {id_gallery: id_gallery,
					    id_module: id_module,
					    userid: userid,
					    modulePath: modulePath,
					    activeModulePath: activeModulePath,
					    language: language,
					    root: root,
					    webmaker: webmaker
					}, function(data){
	    if($('#ajax_align_galleryphoto').length){
		$('#ajax_align_galleryphoto').remove();
	    }
	    
	    if($('.newListSelected').length){
		$('.newListSelected').remove();
	    }

	    if($('.tip').length){
		$('.tip').remove();
	    }
	    
	    $('#container').append(data);
	});
    });

}