function checkForm() {
		var frm = document.frmFeedback;
		if (trim(frm.name.value) == "") {
			alert("Vui long nhap ho ten cua ban!");
			frm.name.focus();
			return false;
		}
		if (frm.address.value.length > 250) {
			alert("Dia chi cua ban khong duoc qua 250 ky tu");
			frm.address.focus();
			return false;
		}
		if (trim(frm.phone.value) == "") {
			alert("Vui long nhap so dien thoai cua ban!");
			frm.phone.focus();
			return false;
		}
		if (trim(frm.email.value) == "") {
			alert("Vui long nhap dia chi email cua ban!");
			frm.email.focus();
			return false;
		} else {
			var email=trim(frm.email.value);
			var emailPat = /^(\".*\"|[A-Za-z]\w*)@(\[\d{1,3}(\.\d{1,3}){3}]|[A-Za-z]\w*(\.[A-Za-z]\w*)+)$/;
			var matchArray = email.match(emailPat);
			if (matchArray == null) {
				alert("Dia chi email khong hop le!");
				frm.email.focus();
				return false;
			}
		}
		if (trim(frm.title.value) == "") {
			alert("Vui long nhap tieu de");
			frm.title.focus();
			return false;
		}
		if (trim(frm.content.value) == "") {
			alert("Vui long nhap noi dung phan hoi!");
			frm.content.focus();
			return false;
		}
		if (frm.content.value.length > 1000) {
			alert("Noi dung thong tin khong duoc qua 1000 ky tu!");
			frm.content.focus();
			return false;
		}
		if (frm.captchacode.value == "") {
			alert("Vui long nhap ma bao ve!");
			frm.captchacode.focus();
			return false;
		}
		$.ajax({
				type:"POST", url: "modules/contact/dopage.asp",
				data:{
					'isNew':	'add',
					'name':		frm.name.value,
					'title':	frm.title.value,
					'address':	frm.address.value,
					'phone':	frm.phone.value,
					'email':	frm.email.value,
					'content':	frm.content.value,
					'code':		frm.captchacode.value,
					'catid': 	frm.hidcatid.value
				},
				success: function(data) {
					if (data.indexOf("err") == -1) {
						$('#formContent').html(data) ;
					} else {
						//$("#msgError").show();
						document.getElementById("msgError").style.display = '';
					}
				},
				errror: function(data) {
					alert(data) ;
				}
		});
	}
function RefreshImage(valImageId) {
	var objImage = document.images[valImageId];
	if (objImage == undefined) {
		return;
	}
	var now = new Date();
	objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
}