(function($) {

	$.extend({
		add2cart: function(source_id, target_id, callback) {
    
      var source = $('#' + source_id );
      var target = $('#' + target_id );
      
      var shadow = $('#' + source_id + '_shadow');
      if( !shadow.attr('id') ) {
          $('body').prepend('<div id="'+source.attr('id')+'_shadow" style="display: none; background-color: #206080; border: solid 1px darkgray; position: static; top: 0px; z-index: 100000;">&nbsp;</div>');
          var shadow = $('#'+source.attr('id')+'_shadow');
      }
      
      if( !shadow ) {
          alert('Cannot create the shadow div');
      }
      
      shadow.width(source.css('width')).height(source.css('height')).css('top', source.offset().top).css('left', source.offset().left).css('opacity', 0.5).show();
      shadow.css('position', 'absolute');
      
      shadow.animate( { width: target.innerWidth(), height: target.innerHeight(), top: target.offset().top, left: target.offset().left }, { duration: 600 } )
        .animate( { opacity: 0 }, { duration: 100 } ).animate({ width:0,height:0},{ duration:0 }).blur().queue(function () {
        source.blur();
	$.ajax({
	   	type: "POST",
   		url: "do_koszyka.php",
		data: "szt=1&tow="+source_id,
		success: function(msg){
     			$("#koszyk").delay(50).text(msg);
   		}

 	});
	$(this).dequeue();
		});
	}
	});
})(jQuery);