jQuery.fn.limitMaxlength = function(options){

  var settings = jQuery.extend({
    attribute: "maxlength",
    onLimit: function(){},
    onEdit: function(){}
  }, options);
  
  // Event handler to limit the textarea
  var onEdit = function(){
    var textarea = jQuery(this);
    var maxlength = parseInt(textarea.attr(settings.attribute));

    if(textarea.val().length > maxlength){
      textarea.val(textarea.val().substr(0, maxlength));
      
      // Call the onlimit handler within the scope of the textarea
      jQuery.proxy(settings.onLimit, this)();
    }
    
    // Call the onEdit handler within the scope of the textarea
    jQuery.proxy(settings.onEdit, this)(maxlength - textarea.val().length);
  }

  this.each(onEdit);

  return this.keyup(onEdit)
        .keydown(onEdit)
        .focus(onEdit);
}

jQuery(document).ready(function(){
  
  var onEditCallback = function(remaining){
    jQuery(this).parent().prev('.charsRemaining').text("Pozostało znaków: " + remaining);
    
  }
  
  var onLimitCallback = function(){
   
  }
  
  jQuery('textarea[maxlength]').limitMaxlength({
    onEdit: onEditCallback,
    onLimit: onLimitCallback
  });
});