///////////////////////////////////////////////////////
// JavaScript form validation functions script.  
///////////////////////////////////////////////////////
function isBlank(Ctrl) {  // returns true if blank	
	if (Ctrl.value.length < 1) return true;
	else if (isEmpty(Ctrl.value)) return true;
	else return false; }
function isEmpty(s) { // prevents entering empty strings
	for (var i = 0; i < s.length; i++) {
		var c = s.charAt(i);
		if ((c != ' ') && (c != '\n') && (c != '\t')) return false; 
	}
	return true; }
function isSpacey(Ctrl) { // true if string has spaces, return, or tab
    var s = Ctrl.value;
	for (var i = 0; i < s.length; i++) { var c = s.charAt(i);
		if ((c == ' ') || (c == '\n') || (c == '\t')) return true; }
	return false; }
function isTooShort(Ctrl,num) {
	if (Ctrl.value.length < num) return true;
	else return false; }
function isTooLong(Ctrl,num) {
	if (Ctrl.value.length > num) return true;
	else return false; }
function isIndexOf(Ctrl,str) { // returns true if substring found in string
	if (Ctrl.value.indexOf(str) > -1) return true;
	else return false; }
function isNotANumber(Ctrl) {  // returns true if not a number
	if (isNaN(Ctrl.value)) return true;
	else return false; }
function isChecked(Ctrl) {
	if (Ctrl.checked) return true;
	else return false; }
function isCheckedByLength(Ctrl) {	// for multiple checkboxes with same name
	var boxIsChecked = false;
	for (i=0; i < Ctrl.length; i++) { if (Ctrl[i].checked) { boxIsChecked = true; break; }}
	if (!boxIsChecked) return true;
	else return false; }
function isSelected(Ctrl, index){  // returns true if the index indicated is selected
	if (Ctrl.options[index].selected) return true;
	else return false; }
function isSelectedOrHigher(Ctrl, upLimit){ // works with numerically-valued select options only!
	var ctrlValue = Ctrl.options[Ctrl.selectedIndex].value;
   if (ctrlValue == 0) return true;
	else if (ctrlValue > upLimit) return true;
	else return false; }
function isSelectedRange(Ctrl, loLimit, upLimit){ // works with numerically-valued select options
	var ctrlRangeValue = Ctrl.options[Ctrl.selectedIndex].value;
	if (!(ctrlRangeValue > loLimit && Ctrl.value < upLimit)) return true;
	else return false; }
    
function checkZip(Ctrl) {  // returns true if not properly formatted zip code
	zipString = Ctrl.value;
	if (zipString.length == 5) {
		if (isNaN(zipString)) return true;
	} else if (zipString.length < 5) {
		return true;
	} else if ( 
	   zipString.length < 10 ||
	   isNaN( zipString.substring(0,5) ) || 
	   isNaN( zipString.substring(6,10) ) ||
	   (zipString.substring(5,6) != '-') ) {
			return true;
	} 
	else return false;
}	// end checkZip()
function testSimpleEmail(Ctrl){  // returns true if invalid email
   var err=0;
   emailString = Ctrl.value;
   if (window.RegExp) {
      var regexEmail = /^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*\.(([a-zA-Z]{2,3})|(aero|coop|info|museum|name|biz))$/;
      return !regexEmail.test(emailString);
   } else {
   	if (emailString.indexOf("@",1) == -1) err=1;  // need @ symbol
   	if (emailString.indexOf("@",1) != emailString.lastIndexOf("@")) err=1;  // only one @ symbol
   	if (emailString.indexOf(".",3) == -1) err=1;  // need at least one "."
   	if (emailString.lastIndexOf(".") == (emailString.length-1)) err=1;  // can't end with a "."
   	// check length
   	if (err==0) {
   		var at = (emailString.indexOf("@"))+1;
   		var lastDot = (emailString.lastIndexOf("."))+1;
   		// test to make sure there's at least one character between "at" and "lastDot"
   		if (lastDot - at == 1) err=1;
   	}
   }
   if (err==1) return true;
	else return false;
}	// end testSimpleEmail()
function checkDateWSlash(Ctrl) {
   var err=0;
   a = Ctrl.value;
	var firstSlash=(a.indexOf("/")) + 1;
	var secondSlash=(a.lastIndexOf("/")) + 1;	
   if (a.length != secondSlash+4) err=1;			// four-digit year
	if (err == 0) {
		// set date variables for testing
	   b = a.substring(0, firstSlash-1); 				// month
	   c = a.substring(firstSlash-1, firstSlash); 	
	   d = a.substring(firstSlash, secondSlash-1); 	// day		
	   e = a.substring(secondSlash-1, secondSlash); 
	   f = a.substring(secondSlash, secondSlash+4); // year		
		if (isNaN(b)) err=1;
		if (isNaN(d)) err=1;
		if (isNaN(f)) err=1;		
	   if (d.indexOf("/") != -1) err=1;
	   if (b<1 || b>12) err=1;
	   if (c != '/') err=1;
	   if (d<1 || d>31) err=1;
	   if (e != '/') err=1;
	   if (f<1800 || f>2500) err=1;  // valid year range
		if ((b==4 || b==6 || b==9 || b==11) && d==31)  err=1;
	   if (b==2) {							// February
	       var g=parseInt(f/4);
	       if (isNaN(g)) err=1;
	       else if (d>29) err=1;
	       else if (d==29) {
            /* Leap year rules: the year is a leap year if it is divisible by 4, e.g. 1960 
               UNLESS divisible by 100 - it is not a leap year, e.g. 1900
               UNLESS divisible by 400 - it is a leap year, e.g. 2000 */
            var isDivBy4   = (f %   4 == 0) ? true : false;
            var isDivBy100 = (f % 100 == 0) ? true : false;
            var isDivBy400 = (f % 400 == 0) ? true : false;
            if (!isDivBy4) err = 1;
            if (isDivBy100 && !isDivBy400) err = 1;
          } 
	   }
	}
   if (err==1) return true;
   else return false; 
} // end checkDateWSlash()

function isCCNumber(Ctrl) {
   var cnum = Ctrl.value;
   // clean number
   if (window.RegExp) cnum = cnum.replace(/[^0-9]*/g,"");
   else {
      var a = '';  var allnum =  '1234567890';
      for (var i = 0; i < cnum.length; i++) {
         var c = s.charAt(i);
         if (allnum.indexOf(c) > -1) a += c;
      }
      cnum = a;
   }
   var lgth = cnum.length;

   if (lgth > 19) return false;
   else if (lgth < 15) return false;
   else {
      // validate number
      tally = 0; multTemp = 0; 
      lengthCheck = lgth % 2;
      if (lengthCheck == 0) { counter = 2; } else { counter = 1; }
      
      for (i = 0; i < lgth; i++) {
         tempNumb = parseInt(cnum.charAt(i));
         multTemp = tempNumb * counter;
         if (multTemp >= 10) {
            multTemp2 = parseInt(multTemp.charAt(0)) + parseInt(multTemp.charAt(multTemp.length));
				//multTemp2 = parseInt(multTemp.toString().charAt(0)) + parseInt(multTemp.charAt(multTemp.toString().length));
            multTemp = multTemp2;
         }
         tally += multTemp; multTemp = 0;
         if (counter == 1) counter = 2; else counter = 1;
      }
      if (tally % 10 != 0) return false;
   } 
   return true;
}   

function isSSN(Ctrl) {
   var s = Ctrl.value;
   if (window.RegExp) {
      // only numbers or hypens
      if ( s.search(/[^-0-9]/) > -1 ) return false;
      // clean up number
      s = s.replace(/[^0-9]*/g,"");
   } else {
      var myA = '';  var myAllnum =  '1234567890';
      for (var i = 0; i < cnum.length; i++) {
         var c = s.charAt(i);
         if (myAllnum.indexOf(c) > -1) myA += c;
      }
      s = myA;   
   } 
   if (s.length == 9) return true;
   else return false;
}

function errorAlert(e) {
    // If ErrorString "e" has content, there was at least one error; let them know.
	if (e.length > 0) {
		msg  = "____________________________________________________\n\n";
		msg += "  The form was not submitted for the following reason: \n";
		msg += "____________________________________________________\n";
		alert(msg + e);
		return false;
	} else {
        return true;
    }
} // end errorAlert()