[ОлегА]

function sendData()
	{ 
        var ret = {'result' : true};
		commentForm.find('button').hide().next().show();
		sendDataComment.docid = commentForm.find("#login").val();
		$.post(
			"savecomment.php",
			sendDataComment,
			function(data){
				if(data)
				{
					data = $.parseJSON(data);
					var errors ='';
					$.each(data, function(i, val) {
						errors += val+'\n';
						
					});
                                        
                    if(errors)
                         ret['result'] = false;

					//return ("textarea").addClass('error-data');
					commentForm.find('button').show().next().hide();
					//alert(errors);
					
				}
				else 
					formToComment(); 
			}
		)

return  ret['result'];
}

if(! sendData()){
/*  ошибки в каких то полях */
}