function isEmpty(inputVal) {
	if (inputVal == null || inputVal == "") {
		return true
		}
	return false
}


function isPosInteger(inputVal) {
	if (isEmpty(inputVal)) {
		return false
		}
	inputStr = inputVal.toString()
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)
		if (oneChar < "0" || oneChar > "9") {
			return false
		}
	}
	return true
}


function isInteger(inputVal) {
	if (isEmpty(inputVal)) {
		return false
		}
	inputStr = inputVal.toString()
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)
		if (i == 0 && oneChar == "-") {
			continue
		}
		if (oneChar < "0" || oneChar > "9") {
			return false
		}
	}
	return true
}


function isDecimal(inputVal) {
	var val = parseFloat(inputVal);
	if (isNaN(val)) return false;
	return true;
}

function isPosDecimal(inputVal) {
	var val = parseFloat(inputVal);
	if (isNaN(val)) return false;
	if (val > 0) return true;
	return false;
}


function inRange(inputStr,i,j) {
	if (!isInteger(inputStr)) {
		return false
		}
	num = parseInt(inputStr)
	if (num < i || num > j) {
		return false
	}
	return true
}


function isChecked(field) {
	j = -1
	for (var i = 0; i < field.length; i++) {
		if (field[i].checked) {
			j = i
			}
		}
		if (j == -1) {
		return false
	}
	return true
}


function validEmail(email) {
	invalidChars = " /:,;"
	if (email == "") {
		return false
	}
	for (i=0; i<invalidChars.length;i++) {
		badChar = invalidChars.charAt(i)
		if (email.indexOf(badChar,0) > -1) {
		return false
	}
	atPos = email.indexOf("@",1)
	if (atPos == -1) {
			return false
		}
	}
	if (email.indexOf("@",atPos+1) > -1) {
		return false
	}
	periodPos = email.indexOf(".",atPos)
	if (periodPos == -1) {
		return false
	}
	if (periodPos+3 > email.length) {
		return false
		}
	return true
}

function validFile(fileName) {
	invalidChars = "!@#$%^&*()\\+={}[]\"\'<>?`\| /:,;"
	if (fileName == "") {
		return false
	}
	for (i=0; i<invalidChars.length;i++) {
		badChar = invalidChars.charAt(i)
		if (fileName.indexOf(badChar,0) > -1) {
			return false
		}
	}
	periodPos = fileName.indexOf(".",1)
	if (periodPos == -1) {
		return false
	}
	if (periodPos+4 > fileName.length) {
		return false
		}
	return true
}

function minLen(str,i) {
	if (str.length < i) {
		return false
		}
	return true
}

function isHexColor(inputVal) {
	inputStr = inputVal.toString()
	if (inputStr.length != 6 && inputStr.length != 0) {
		return false
		}
	var j = -1
	for (var i = 0; i < inputStr.length; i++) {
		var c = inputStr.charAt(i)
		if (!( ((c >= "a") && (c <= "f")) || ((c >= "A") && (c <= "F")) || ((c >= "0") && (c <= "9")) )) {
		j += 1
		break
		}
	}
	if (j > -1) {
		return false
		}
	return true
}

function isYear (s)
{   if (isEmpty(s)) 
       if (isYear.arguments.length == 1) return false;
       else return (isYear.arguments[1] == true);
    if (!isPosInteger(s)) return false;
    return ((s.length == 2) || (s.length == 4));
}

function isMonth (s)
{   if (isEmpty(s)) 
       if (isMonth.arguments.length == 1) return false;
       else return (isMonth.arguments[1] == true);
    return inRange (s, 1, 12);
}

function isDay (s)
{   if (isEmpty(s)) 
       if (isDay.arguments.length == 1) return false;
       else return (isDay.arguments[1] == true);   
    return inRange (s, 1, 31);
}

function makeArray(n) {
   for (var i = 1; i <= n; i++) {
      this[i] = 0
   } 
   return this
}

var daysInMonth = makeArray(12);
	daysInMonth[1] = 31;
	daysInMonth[2] = 29;   // must programmatically check this
	daysInMonth[3] = 31;
	daysInMonth[4] = 30;
	daysInMonth[5] = 31;
	daysInMonth[6] = 30;
	daysInMonth[7] = 31;
	daysInMonth[8] = 31;
	daysInMonth[9] = 30;
	daysInMonth[10] = 31;
	daysInMonth[11] = 30;
	daysInMonth[12] = 31;

function daysInFebruary (year)
{   return (  ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );
}

function isDate (year, month, day)
{   if (! (isYear(year) && isMonth(month) && isDay(day))) return false;

    var intYear = parseInt(year);
    var intMonth = parseInt(month);
    var intDay = parseInt(day);

    if (intDay > daysInMonth[intMonth]) return false; 

    if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;

    return true;
}





stateArray = new Array("AA","AE","AL","AK","AP","AS","AZ","AR","CA","CO","CT","DE","DC","FM","FL","GA","GU","HI","ID","IL","IN","IA","KS","KY","LA","ME","MH","MD","MA","MI","MN","MS","MO","MT","NE","NV","NH","NJ","NM","NY","NC","ND","MP","OH","OK","OR","PW","PA","PR","RI","SC","SD","TN","TX","UT","VT","VI","VA","WA","WV","WI","WY")

function isState(inputVal) {
	if (isEmpty(inputVal)) {
		return false
		}
	inputStr = inputVal.toString()
	inputStr = inputStr.toUpperCase()
	
	for (i=0; i<stateArray.length; i++) {
		if (inputStr == stateArray[i]) {
			return true
		}
	}
	return false
}

function isCreditCard(st) {
  // Encoding only works on cards with less than 19 digits
  if (st.length > 19)
	return (false);

  sum = 0; mul = 1; l = st.length;
  for (i = 0; i < l; i++) {
	digit = st.substring(l-i-1,l-i);
	tproduct = parseInt(digit ,10)*mul;
	if (tproduct >= 10)
	  sum += (tproduct % 10) + 1;
	else
	  sum += tproduct;
	if (mul == 1)
	  mul++;
	else
	  mul--;
  }
  if ((sum % 10) == 0)
	return (true);
  else
	return (false);

}

function stripCharsNotInBag (s, bag)
{   var i;
	var returnString = "";
	for (i = 0; i < s.length; i++)
	{   
		var c = s.charAt(i);
		if (bag.indexOf(c) != -1) returnString += c;
	}
	return returnString;
}

function stripNonDigits (s)
{   var i;
	var bag = '0123456789';
	var returnString = "";
	for (i = 0; i < s.length; i++)
	{   
		var c = s.charAt(i);
		if (bag.indexOf(c) != -1) returnString += c;
	}
	return returnString;
}

// Sample number: 4111 1111 1111 1111 (16 digits)
function isVisa(cc)
{
  cc = stripNonDigits(cc);
  if (((cc.length == 16) || (cc.length == 13)) &&
	  (cc.substring(0,1) == 4))
	return isCreditCard(cc);
  return false;
}

// Sample number: 5500 0000 0000 0004 (16 digits)
function isMasterCard(cc)
{
  cc = stripNonDigits(cc);
  firstdig = cc.substring(0,1);
  seconddig = cc.substring(1,2);
  if ((cc.length == 16) && (firstdig == 5) &&
	  ((seconddig >= 1) && (seconddig <= 5)))
	return isCreditCard(cc);
  return false;

}

// Sample number: 340000000000009 (15 digits)
function isAmex(cc)
{
  cc = stripNonDigits(cc);
  firstdig = cc.substring(0,1);
  seconddig = cc.substring(1,2);
  if ((cc.length == 15) && (firstdig == 3) &&
	  ((seconddig == 4) || (seconddig == 7)))
	return isCreditCard(cc);
  return false;

}

function isAmericanExpress(cc)
{
	return isAmex(cc);
}


function isDiscover(cc)
{
  cc = stripNonDigits(cc);
  first4digs = cc.substring(0,4);
  if ((cc.length == 16) && (first4digs == "6011"))
	return isCreditCard(cc);
  return false;
} 

function isJCB(cc)
{
  cc = stripNonDigits(cc);
  firstdig = cc.substring(0,1);
  first4digs = cc.substring(0,4);
  if (	 ((cc.length == 15) && ((first4digs == "2131") || (first4digs == "1800")))
	  || ((cc.length == 16) && (firstdig == 3))
	 )
	return isCreditCard(cc);
  return false;
} 


/*	function custWindow(doc, w, h [,align, valign [, scroll] ] ) {

	function that opens window with size and optional location and scroll input

	arguments:
	'doc'		is the document that will load in the new window
	'w'			is the width of the window in pixels
	'h'			is the height of the window in pixels
	'align'		is the horizontal alignment (l, c, or r)
	'valign'	is the vertical alignment (t, m, or b)
	'scroll'	indicates whether or not to display scrollbars (yes or no)
*/
function custWindow(doc,w,h,align,valign,scroll) {
	if (custWindow.arguments.length < 6) {
		var scroll = 'yes'
		}
	if (custWindow.arguments.length < 4) {
		var align = 'c'
		var valign = 'm'
		}
	topPos=0
	leftPos=0
	if (screen) {
		if (align == 'c') {
			leftPos = screen.width/2 - w/2
			} else {
			if (align == 'r') {
				leftPos = screen.width - w - 12
				}
			}
		if (valign == 'm') {
			topPos = screen.height/2 - h/2
			} else {
			if (valign == 'b') {
				topPos = screen.height - h - 45
				}
			}
		}
	custWin = window.open (doc,'custWin','toolbar=no,location=no,scrollbars='+scroll+',resizable=yes,width='+w+',height='+h+',left='+leftPos+',top='+topPos+'')
	custWin.document.close()
	custWin.focus()	
}



function optionVal(field) {
	for (var i=0;i<field.length;i++) {
		if (field[i].checked) return field[i].value;
	}
	return;
}


/*

Error handling functions for form validation. TrŽs cool, man.

*/

var error = new Array();
var field = new Array();

function pushErr(err,fld) {
	error[error.length] = err;
	field[field.length] = fld;
	return;
}

function clearErr(form) {

	for (i=0;i<form.elements.length;i++) {
		form.elements[i].style.backgroundColor='#ffffff';
	}

}

function showErr() {

	if (arguments.length > 0) str = arguments[0] + "\n";
	else str = '';

	if (arguments.length > 1) color = arguments[1];
	else color = '#ffaabb';

	if (error.length == 0) return true;
	
	for(i=0;i<error.length;i++) {
		str += error[i] + "\n";
	}
	alert(str);

	for(i=0;i<field.length;i++) {
		field[i].style.backgroundColor=color;
	}

	field[0].focus();
	error = new Array();
	field = new Array();
	return false;
}