function checkEmail(form) {
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.email.value)){
		return true;
	}
		return false;
}


function isFilled(elm) {
  if(elm.value == "" || elm.value == null) {
	  return false;
	}
	else {
	  return true;
	}
}

function isReady(form) {
  if(checkEmail(form) == false) {
	  alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}

	
	if(isFilled(form.name) ==  false) {
	  alert("Please enter your name.");
		form.name.focus();
		return false;
	}

	if(isFilled(form.phone) ==  false) {
	  alert("Please enter your phone number.");
		form.phone.focus();
		return false;
	}
	
	if(isFilled(form.depart_city) ==  false) {
	  alert("Please enter your departure city.");
		form.depart_city.focus();
		return false;
	}
	
	return true;
}