$('.link').click(function(){

	var params = {'answer' : $(this).attr('answer')};
	var href = $(this).attr('href');
		
	$.post(
		url: href,
		data :params,
		success: function(data){
			switch(data.success){
				case 1: //success
					alert('Correct Response: ' + data.message);
				break;
				
				case 0: //failure
					alert('Incorrect Response: ' + data.message);
				break;
				
				default: //anything else - in this case, an error.
					alert('Error! ' + data.message);
				break;		
			
			}
		},
		dataType: 'json'
	);
	
	return false;	
});

$('.link').click(function(){

	var params = {'answer' : $(this).attr('answer')};
	var href = $(this).attr('href');
		
	$.post(
		href,
		params,
		function(data){
			switch(data.success){
				case 1: //success
					alert('Correct Response: ' + data.message);
				break;
				
				case 0: //failure
					alert('Incorrect Response: ' + data.message);
				break;
				
				default: //anything else - in this case, an error.
					alert('Error! ' + data.message);
				break;		
			
			}
		},
		'json'
	);
	
	return false;	
});

http://www.dropthenerd.com/ajax-a-simple-approach-that-you-will-use-and-reuse/

Simple Ajax Example

ajax

jQuery