$(function(){              
    
        
   $('.a_left').mouseover(function(){        
        var obrazek1 =  $(this).html();
        var obrazek2 = obrazek1.replace('point1.png', 'point1_white.png')
        $(this).html(obrazek2);
   });     
      
   $('.a_left').mouseout(function(){        
        var obrazek1 =  $(this).html();
        var obrazek2 = obrazek1.replace('point1_white.png', 'point1.png')
        $(this).html(obrazek2);
   }); 
});