This is my first post of hopefully many here on code review. I am writing a function for a rotating navigation with JS and jQuery. I am using a plugin called jQuery transit for animating rotation. The code works, but it is very long for such a simple function, is there any way this can be improved.

    var rotation = 0;
    $('nav ul li a').bind('click', function() {
	'use strict';
	var item = $(this).parent();
	var itemI = item.index();
	var navAll = $(this).parents('ul');
			
	var condition = rotation + '_' + itemI;

	switch(condition)
	{
	   case '0_0': 
	        //do nothing
	        break;
	    case '0_1':
	        navAll.transition({rotate: '-=90deg'});
			$('nav ul li a').transition({rotate:'90deg'});
			rotation = 270;
	        break;
	    case '0_2':
	        navAll.transition({rotate: '-=180deg'});
			$('nav ul li a').transition({rotate:'180deg'});
			rotation = 180;
	        break;
	    case '0_3':
	        navAll.transition({rotate: '+=90deg'});
			$('nav ul li a').transition({rotate:'-90deg'});
			rotation = 90;
	        break;


		case '90_0':
	        navAll.transition({rotate: '0deg'});
			$('nav ul li a').transition({rotate:'0deg'});
			rotation = 0;
	        break;
	    case '90_1':
	        navAll.transition({rotate: '-90deg'});
			$('nav ul li a').transition({rotate:'90deg'});
			rotation = 270;
	        break;
	    case '90_2':
	        navAll.transition({rotate: '+=90deg'});
			$('nav ul li a').transition({rotate:'-180deg'});
			rotation = 180;
	        break;
	    case '90_3':
	        break;
	    
	    case '180_0':
	        navAll.transition({rotate: '0deg'});
			$('nav ul li a').transition({rotate:'0deg'});
			rotation = 0;
	        break;
	    case '180_1':
	        navAll.transition({rotate: '-90deg'});
			$('nav ul li a').transition({rotate:'90deg'});
			rotation = 270;
	        break;
	    case '180_2':
	        //do nothing
	        break;
	    case '180_3':
	        navAll.transition({rotate: '-=90deg'});
			$('nav ul li a').transition({rotate:'-90deg'});
			rotation = 90;
	        break;


		case '270_0':
	        navAll.transition({rotate: '0deg'});
			$('nav ul li a').transition({rotate:'0deg'});
			rotation = 0;
	        break;
	    case '270_1':
	        //do nothing
	        break;
	    case '270_2':
	        navAll.transition({rotate: '-=90deg'});
			$('nav ul li a').transition({rotate:'180deg'});
			rotation = 180;
	        break;
	    case '270_3':
	        navAll.transition({rotate: '-=180deg'});
			$('nav ul li a').transition({rotate:'-90deg'});
			rotation = 90;
	        break;

	   
	}

    });