function send_form() {

	 if(document.getElementById('txtName').value == ''){
			 alert('กรุณากรอกชื่อค่ะ')
			 document.getElementById('txtName').focus();
			 return false;
		  }
	  if(document.getElementById('txtTel').value == ''){
         alert('กรุณากรอกเบอร์โทรศัพท์ค่ะ')
         document.getElementById('txtTel').focus();
         return false;
      }
	  if(document.getElementById('txtDetail').value == ''){
         alert('กรุณากรอกที่อยู่ค่ะ')
         document.getElementById('txtDetail').focus();
         return false;
      }
	 /* if(document.getElementById('email').value == '' || !isValidEmail(document.getElementById('email').value) ){
         alert('Email is required! Please correct email address')
         document.getElementById('email').focus();
         return false;
      }*/
}