function validRequired(formField,fieldLabel)
{
   var result = true;

   if (formField.value == "")
   {
      alert('Please enter a value for the "' + fieldLabel +'" field.');
      formField.focus();
      result = false;
   }

   return result;
}
function checkflds(formField,fieldError)
{
   var result = true;
   if (!formField.checked) {
      alert('Please check a value for the "' + fieldError +'" field.');
      formField.focus();
      result = false;
   }
   return result;
}
function checkselect(formField,fieldError)
{
   var result = true;
   if (formField.options[formField.selectedIndex].value=='') {
      alert('Please select a value for the "' + fieldError +'" field.');
      formField.focus();
      result = false;
   }
   return result;
}

function validEmail(formField,fieldLabel,required)
{
   var result = true;

   if (required && !validRequired(formField,fieldLabel))
      result = false;

   if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
   {
      alert("Please enter a complete email address in the form: yourname@yourdomain.com");
      formField.focus();
      result = false;
   }
  return result;
}

function validNumberMiles(formField,fieldLabel,required)
{
   var result = true;
   if (isNaN(formField.value)) {
      alert('Please enter a number of miles or leave blank');
      formField.focus();
      result = false;
   }
  return result;
}
function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
   result = true;
  }
  return result;
}

function validateContactForm(theForm)
{

   // Start ------->
   if (!validRequired(theForm.name,"Your Name"))
      return false;
   if (!validRequired(theForm.tel,"Telephone"))
      return false;
   if (!validRequired(theForm.email,"Email"))
      return false;
   if (!validEmail(theForm.email,"Email Address",true))
      return false;
   if (!validRequired(theForm.comment,"Comment"))
      return false;

   // <--------- End

   return true;
}