function checkValid(){
			var date = new Date()
			day = date.getDate()
			month = date.getMonth() + 1
			year = date.getYear()
			curDate = day + "/" + month + "/" + year
			
			  strFullname		= document.frmDatTiec.txtFullname.value
			  strAddress		= document.frmDatTiec.txtAddress.value
			  strPhone			=document.frmDatTiec.txtPhone.value
			  strEmail			= document.frmDatTiec.txtEmail.value
			  strDate			= document.frmDatTiec.txtDate.value
			  strNote			= document.frmDatTiec.txtMessage.value

			  if (isempty(strFullname)) {
				  alert("Vui long nhap vao ho ten cua ban.")
				  document.frmDatTiec.txtFullname.focus()
				  return false
			  }

			  if (isempty(strAddress)) {
				  alert("Vui long cho biet dia chi lien he.")
				  document.frmDatTiec.txtAddress.focus()
				  return false
			  }


			  if (isdate(strDate) == false){
					  alert("Vui long cho biet ngay to chuc tiec cuoi.");
					  document.frmDatTiec.txtDate.focus();
					  return false
			  } else if (comparedate(curDate,strDate)==false) {
					  alert("Ngay dat tiec khong the nho hon ngay hien hanh");
					  document.frmDatTiec.txtDate.focus();
					  return false
			  }

			  if (isempty(strNote)) {
				  alert("Vui long nhap noi dung can yeu cau.")
				  document.frmDatTiec.txtMessage.focus()
				  return false
			  }
	 }