function checkForm() {
		var frm = document.frmFeedback;
		if (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 (frm.phone.value == "") {
			alert("Vui long nhap so dien thoai cua ban!");
			frm.phone.focus();
			return false;
		}
		if (frm.email.value == "") {
			alert("Vui long nhap dia chi email cua ban!");
			frm.email.focus();
			return false;
		} else {
			var email=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 (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;
		}
		frm.submit();
	}
		function checkLogo() {
		var frm = document.frmLogo;
		if (frm.name.value == "") {
			alert("Vui long nhap ho ten cua ban!");
			frm.name.focus();
			return false;
		}
		if (frm.email.value == "") {
			alert("Vui long nhap dia chi email cua ban!");
			frm.email.focus();
			return false;
		} else {
			var email=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 (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;
		}
		frm.submit();
	}