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('REQUIRED: Please enter ' + fieldLabel +'');
		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/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}

function fixExpDate(w)
{
	var x = w.value;
	var nums = x.split("/");
	var now = new Date();
	var nowyy = now.getYear() % 100;
	var nowmm = now.getMonth() + 1;
	var mm;
	var yy;
		
	var message = "Please enter your expiration date as \"MM/YY\", e.g. 05/06 for May 2006";
	if ((nums.length <= 1) || (nums.length > 2)) {
		alert(message);
		if (nums.length == 1) {
			mm = parseInt(nums[0]) % 100;
			if (mm + "" == "NaN")
				mm = nowmm;
			mm = Math.max(1,Math.min(mm,12));
		} else {
			mm = nowmm;
		}
		yy = nowyy;
	} else {
		mm = parseInt(nums[0]) % 100;
		yy = parseInt(nums[1]) % 100;
		if (mm < 1 || mm > 12) {
			alert("Please enter a month between 1 and 12");
			mm = Math.max(1,Math.min(mm,12));
		} else if (yy < nowyy) {
			alert("Please enter a year after this year.");
			yy = nowyy;
		} else if ((yy == nowyy) && (mm < nowmm)) {
			alert("The expiration date you have entered has already expired.\nPlease enter a date in the future, or use another credit card.");
			mm = nowmm;
			yy = nowyy;
		} else {
			return;
		}
	}
	if (mm < 10) mm = "0" + mm;
	if (yy < 10) yy = "0" + yy;
	w.value = mm + "/" + yy;
	w.focus();
	return false;
}

function shipAddressCheck(w)
{
	var f = w.form;
	
	f.Ship_To_First_Name.disabled = w.checked;
	f.Ship_To_Last_Name.disabled = w.checked;
	f.Ship_To_Address.disabled = w.checked;
	f.Ship_To_City.disabled = w.checked;
	f.Ship_To_State.disabled = w.checked;
	f.Ship_To_Zip.disabled = w.checked;
}

function fixCC(w)
{
	var cc = w.value;
	var r = "";
	var i;
	var d;
	var valid = "0123456789";
	
	for (i = 0; i < cc.length; i++) {
		d = cc.substring(i,i+1);
		if (valid.indexOf(d) >= 0) {
			r = r + d;
		}
	}
	w.value = r.substring(0,16);
}

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

	// Start ------->

	if (!validRequired(theForm.Gift_Designation,"Your Designation of the gift"))
		return false;
	
	if (!validRequired(theForm.Publication_Name,"Your Name For Publications"))
		return false;

	if (!validRequired(theForm.Card_Type,"Your Credit Card Type"))
		return false;
		
	if (!validRequired(theForm.Card_Expire_Month,"Your Credit Card Expire Month"))
		return false;

	if (!validRequired(theForm.Card_Expire_Year,"Your Credit Card Expire Year"))
		return false;

	if (!validRequired(theForm.Card_Number,"Your Credit Card Number"))
		return false;

	if (!validRequired(theForm.Name_On_Card,"Your Name As It Appears On Your Credit Card"))
		return false;
		
	if (!validRequired(theForm.Gift_Amount,"Your Gift Amount"))
		return false;
		
	if (!validRequired(theForm.First_Name,"Your Billing First Name"))
		return false;
		
	if (!validRequired(theForm.Last_Name,"Your Billing Last Name"))
		return false;

	if (!validRequired(theForm.Street,"Your Billing Street Address"))
		return false;
		
	if (!validRequired(theForm.City,"Your Billing City"))
		return false;
		
	if (!validRequired(theForm.State,"Your Billing State"))
		return false;
		
	if (!validRequired(theForm.Zip,"Your Billing Zip Code"))
		return false;

	if (!validRequired(theForm.Evening_Phone,"Your Evening Phone Number"))
		return false;
		
	if (!validEmail(theForm.Email,"Your Email Address",true))
		return false;

	if (!validRequired(theForm.GSB_Affiliation,"Your Affiliation to GSB"))
		return false;
	
	if (!validRequired(theForm.Comments,"Your Questions or Comments"))
		return false;
		
	// <--------- End
	
	return true;
}