(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: #ddd; border: solid 1px darkgray; position: static; top: 0px; z-index: 100000;">&nbsp;</div>');var shadow = $('#'+source.attr('id')+'_shadow');}shadow.width(source.css('width')).height(source.css('height')).css('top', source.offset().top).css('left', source.offset().left).css('opacity', 0.5).show();shadow.css('position', 'absolute');shadow.animate( { width: target.innerWidth(), height: target.innerHeight(), top: target.offset().top, left: target.offset().left }, { duration: 300 } ).animate( { opacity: 0 }, { duration: 200, complete: function() {$("#"+source.attr('id')+"_shadow").css({'display': 'none'});} } );}});})(jQuery);