function datefocus(id) {
	field = document.getElementById(id);
	if(field.value == ' mm/dd/yy') {
		field.value='';
		field.className='ihdate_complete';
	}
}

function dateblur(id) {
	field = document.getElementById(id);
	if(field.value == '') {
		field.value=' mm/dd/yy';
		field.className='ihdate';
	}
}


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 allDigits(str)
{
        return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
        var result = true;

        // Note: doesn't use regular expressions to avoid early Mac browser bugs
        for (var i=0;i<str.length;i++)
                if (charset.indexOf(str.substr(i,1))<0)
                {
                        result = false;
                        break;
                }

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

        return result;
}


function validInt(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 = allDigits(elems[0]) && (month > 0) && (month < 13) &&
                                         allDigits(elems[1]) && (day > 0) && (day < 32) &&
                                         allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
                }

                if (!result)
                {
                        alert('Please enter a date in the format MM/DD/YY for the "' + fieldLabel +'" field.');
                        formField.focus();
                }
        }

        return result;
}

function validateForm(theForm)
{

        if (!validRequired(theForm.firstname,"First Name"))
                return false;

        if (!validRequired(theForm.lastname,"Last Name"))
                return false;

        // if (!validDate(theForm.arrival_date,"Arrival Date", true))
        //        return false;

        // if (!validDate(theForm.departure_date,"Departure Date", true))
        //      return false;

        if (!validEmail(theForm.email,"Email Address",true))
                return false;

        // if (!validRequired(theForm.phone,"Phone"))
        //        return false;

        return true;
}