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

  if (required && !validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {
     var num = parseInt(formField.value,10);
     if (isNaN(num))
     {
       alert('Please enter a number for the "' + fieldLabel +'" field.');
      formField.focus();    
      result = false;
    }
  } 
  
  return result;
}

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

  if (required && !validRequired(formField,fieldLabel))
    result = false;
  
   if (result)
   {
     var elems = formField.value.split("/");
     
     result = (elems.length == 3); // should be three components
     
     if (result)
     {
       var month = parseInt(elems[0],10);
        var day = parseInt(elems[1],10);
       var year = parseInt(elems[2],10);
      result = !isNaN(month) && (month > 0) && (month < 13) &&
            !isNaN(day) && (day > 0) && (day < 32) &&
            !isNaN(year) && (elems[2].length == 4);
     }
     
      if (!result)
     {
       alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
      formField.focus();    
    }
  } 
  
  return result;
}

function validateEmailForm(theForm)
{
  // Customize these calls for your form

  // Start ------->

  if (!validEmail(theForm.from,"Email Address",true))
    return false;
	
  if (!validRequired(theForm.subject,"Subject"))
    return false;

  if (!validRequired(theForm.comments,"Comment"))
    return false;
//  if (!validDate(theForm.available,"Date Available",true))
//    return false;

//  if (!validNum(theForm.yearsexperience,"Years Experience",true))
//    return false;
  // <--------- End
  
  return true;
}

function validateRegisterForm(theForm)
{
  if (theForm.userid.value.length<5 || theForm.userid.value.length>15)
  {
	alert('UserID is an invalid length. Valid UserIDs are 5 to 15 characters.');
	theForm.password1.focus();
	theForm.password2.value = '';
	return false;
  }
  if (!validRequired(theForm.name, "Name"))
  	return false;
  if (theForm.password1.value.length<5 || theForm.password1.value.length>15 || theForm.password2.value.length<5 || theForm.password2.value.length>15)
  {
	alert('Password is an invalid length. Valid passwords are 5 to 15 characters.');
	theForm.password1.value = '';
	theForm.password2.value = '';
	theForm.password1.focus();
	return false;
  }
  if (theForm.password1.value != theForm.password2.value)
  {
	alert('First and Second passwords do not match.');
	theForm.password1.value = '';
	theForm.password2.value = '';
	theForm.password1.focus();
	return false;
  }
  if (!validEmail(theForm.email,"Email Address",true))
    return false;
  if (!validNum(theForm.postamount,"Post Amount",true))
  	return false;
	
  return true;
}

function validateSetupForm(theForm)
{
  
  if (theForm.newpassword1.value.length<5 || theForm.newpassword1.value.length>15 || theForm.newpassword2.value.length<5 || theForm.newpassword2.value.length>15)
  {
  	if (theForm.newpassword1.value.length!=0 && theForm.newpassword2.value.length!=0)
	{
		if (theForm.newpassword1.value != theForm.newpassword2.value)
		{
			alert('First and Second passwords do not match.');
			theForm.newpassword1.value = '';
			theForm.newpassword2.value = '';
			theForm.newpassword1.focus();
		return false;
		}
		alert('Password is an invalid length. Valid passwords are 5 to 15 characters.');
		theForm.newpassword1.value = '';
		theForm.newpassword2.value = '';
		theForm.newpassword1.focus();
		return false;
	}
  }
  if (!validEmail(theForm.email,"Email Address",true))
    return false;
  if (!validNum(theForm.postamount,"Post Amount",true))
  	return false;
	
  return true;
}

function validatePlayForm(theForm)
{
  if (!validRequired(theForm.firstname,"First Name"))
    return false;
  if (!validRequired(theForm.lastname,"Last Name"))
    return false;
  if (!validEmail(theForm.email,"Email Address",true))
    return false;
  if (!validNum(theForm.birthday, "Birth Day", true))
  	return false;
  if (!validNum(theForm.birthmonth, "Birth Month", true))
  	return false;
  if (!validNum(theForm.birthyear, "Birth Year",true))
  	return false;
  if (!validRequired(theForm.position, "Position"))
  	return false;
  if (!validRequired(theForm.collegelast, "College (last year)"))
  	return false;
  var test = false;
  for (i=0, n=theForm.classlast.length; i<n; i++) {
	if (theForm.classlast[i].checked) {
		test = test || theForm.classlast[i].value;
	break;
	}
  }
  if(!test)
  {
  	alert('Class (last year) is required.');
  	return false;
  }
  
  return true;
}