(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: #285682; border: solid 1px #000000; 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', 0.3).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, complete: callback } );

		}
	});
})(jQuery);

function add2cart_action() {
	window.document.forms['to_cart'].submit();
}