Неработает AJAX средствами JQUERY

$(document).ready(function(){
	$("a.menu").click(function(){
		var type = $(this).attr("id");
		var location = "assets/snippets/n2_galery/tpl_prevew.php";
		var sendData = "q="+location+"&type="+type;
		
		$.ajax({
			type: "POST",
			url: "http://modx/index-ajax.php",
			data: sendData,
			beforeSend: waiton(),
			complete: waitoff(),
			success: function(result){
				$(".content").html(result);
   			}
		});
	});
});

$j.ajax({
					url: "index-ajax.php",             
					dataType : "html",                    	
					data: "q=assets/snippets/ajax/ajax.php&id="+id,
					type: "POST",						
					success: function(msg){show(msg);}				
			     });

header('Content-type: text/html; charset=utf-8',TRUE);

Error thrown at line 20, column 2 in <anonymous function>() in http://modx/assets/snippets/n2_galery/js/ajax.js:
    $.ajax({
called from line 55, column 294 in <anonymous function: handle>(a) in http://modx/assets/js/jQuery.js:
    i=i.handler.apply(this,arguments);
called via Function.prototype.apply() from line 49, column 569 in <anonymous function: o>() in http://modx/assets/js/jQuery.js:
    return typeof c!=="undefined"&&!c.event.triggered?c.event.handle.apply(o.elem,arguments):w

jQuery.noConflict();
jQuery(document).ready(function(){
	jQuery("a.menu").click(function(){
		var type = jQuery(this).attr("id");
		var location = "assets/snippets/n2_galery/tpl_prevew.php";
		var sendData = "q="+location+"&type="+type;
		
		jQuery.ajax({
			type: "POST",
			url: "http://modx/index-ajax.php",
			data: sendData,
			beforeSend: waiton(),
			complete: waitoff(),
			success: function(result){
				jQuery(".content").html(result);
   			}
		});
	});
});