Adding counter to sequential list using Jquery

In my design work ,I have to create sequential lists ,for example ,a list of blog comments ,lists of users ... adding counter to these lists will make it look better but sometime it's hard to do manually . I find out a solution from webdesignerwall.com ,using jquery to add numbers to the list .Live Demo  Here is detail instruction :1,First,we need CSS code to decorating numbers  /* number style *