$(document).ready(function() {
    var votefactory = function(action) {
        $('img[id^=' + action + ']').each(function(){
            var id = $(this).attr('id').match(/\d+/);
            $(this).click(function(){                
                $.post('/vote.aspx', 
                       { id : id, action : action }, 
                       function(data){
                            $('#ptCounter' + id).text(data.replace(/\s+/,""));
                       },
                       'text'
                ); // $.post()
            }); // .click()
        }); // .each()
    } // voteFactory()
    
    votefactory('votedown');
    votefactory('voteup');        
});