$('.pole').each(function(){
var $this = $(this),
$count = $this.find('.count');
$(this).bind('click', function(){
...
if(request.status === 200 && request.readyState === 4) {
var num = $this.find('.count').text() - 0;
$count.text(num + 1);
} else {
$count.text('Error');
}
});
});
Не? Для любителей чистоты добавлю:
var poles = document.getElementsByClassName('pole');
for(var i = 0; i < poles.length; i++){
poles[i].addEventListener('click', function(){
var count = this.childNodes[3],
num = count.innerHTML - 0;
count.innerHTML = num + 1;
});
}