function retrieveComments(site,lang,page,callback){
	
	var url = '/php/comments/retrieve.php';
	
	var data = 'site='+site+'&lang='+lang;
	
	if(page) data += '&page='+page;

	jQuery.ajax({
	  url: url,
	  data: data,
	  cache: false,
	  success: function(xml){
		callback.call(this,jQuery(xml), site, lang);
	  }
	});	
	
}