// JavaScript Document
function addHabtmItem(url){
	$.ajax({
	    url: url,
	    type: 'POST',
	    data: {item_id: $("#habtm_picker option:selected").val()},
	    error: function(){
	        alert('Error');
	    },
	    success: function(data){
	        // do something
	        $('#selected_habtm').html(data);
	    }
	});
}

function deleteHabtmItem(url){
	$.ajax({
	    url: url,
	    type: 'POST',
	    error: function(){
	        alert('Error');
	    },
	    success: function(data){
	        // do something
	        $('#selected_habtm').html(data);
	    }
	});
}