function validate_field(field, alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);focus();return false;}
}
}

function ValidateEmail()
{
  var EmaiAddress=document.getElementById("mail").value;
  var RegExEmail = /^.+@.+\..{2,3}$/;	
  if (!RegExEmail.test(EmaiAddress))
  {
    alert("Please Enter Valid E-mail Adress");
		document.getElementById("mail").focus()
		return false;
  }
  else
  {
    return true;
  }
} 


function validate_feedback(thisform)
{
with (thisform)
{
  if (validate_field(mail, "Please enter your mail!")==false)
    {return false;}
	return ValidateEmail();
}
}

function validate_form(thisform)
{
with (thisform)
{
  if (validate_field(name, "Please enter your name!")==false)
  {return false;}
  else 
    if (validate_field(mail, "Please enter your mail!")==false)
    {return false;}
  else 
    if (validate_field(service_date, "Please enter service date!")==false)
    {return false;}
  else 
    if (validate_field(number_passengers, "Please enter the number of passengers!")==false)
    {return false;}
  else 
    if (validate_field(pick_up_time, "Please enter the pick up time!")==false)
    {return false;}		
	return ValidateEmail();
}
}