(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')){source.before('<div id="'+source.attr('id')+'_shadow" style="display: none; background: #cccccc; border: solid 1px #dee66c; position: static; top: 0px; z-index: 5;">&nbsp;</div>');var shadow=$('#'+source.attr('id')+'_shadow');}
if(!shadow){alert('Cannot create the shadow div');}
shadow.width(source.css('width')).height(source.css('height')).css('top',source.offset().top).css('left',source.offset().left).css('opacity',0.9).show();shadow.css('position','absolute');shadow.animate({width:target.innerWidth(),height:target.innerHeight(),top:target.offset().top,left:target.offset().left},700,function(){$(this).remove()}).animate({opacity:0},{duration:100,complete:callback});}});
})(jQuery);