var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(formField,fieldLabel,required){
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		return false;

 	if (result  && formField.value != ""){
		var dtStr = formField.value;
		var daysInMonth = DaysArray(12)
		var pos1=dtStr.indexOf(dtCh)
		var pos2=dtStr.indexOf(dtCh,pos1+1)
		var strMonth=dtStr.substring(0,pos1)
		var strDay=dtStr.substring(pos1+1,pos2)
		var strYear=dtStr.substring(pos2+1)
		strYr=strYear
		if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
		if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
		for (var i = 1; i <= 3; i++) {
			if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
		}
		month=parseInt(strMonth)
		day=parseInt(strDay)
		year=parseInt(strYr)
		if (pos1==-1 || pos2==-1){
			alert("The \"" + fieldLabel + "\" format should be : mm/dd/yyyy")
			return false
		}
		if (strMonth.length<1 || month<1 || month>12){
			alert("Please enter a valid \""+ fieldLabel +"\" month")
			return false
		}
		if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
			alert("Please enter a valid \""+ fieldLabel +"\" day")
			return false
		}
		if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
			alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear+ " for \""+ fieldLabel +"\"")
			return false
		}
		if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
			alert("Please enter a valid date for \""+ fieldLabel +"\"")
			return false
		}
	return true
	}
}

function validStartEndDates(StartDateField, startFieldLabel, StartRequired, EndDateField, endFieldLabel, EndRequired) {

	if (StartRequired && !validDate(StartDateField,startFieldLabel))
		return false;
	if (EndRequired && !validDate(EndDateField,endFieldLabel))
		return false;
	strStartDate = StartDateField.value;
	strEndDate = EndDateField.value;
	var start_date = new Date(strStartDate);
	var end_date = new Date(strEndDate);
	
	if (start_date.getTime() > end_date.getTime()) { 
		alert('The Start Date must be before the End Date\nThank You.');
		StartDateField.focus;
		return false;
	}
	else { 
		alert('Good Dates');
		return true;
	   }
}

function selectionMade(fieldCollection,fieldLabel,required){
	var itemSelected = false;
	var selection = false;
	for (i=0;i<fieldCollection.length;++ i){
		if(fieldCollection[i].checked){
			itemSelected=true;
			selection = fieldCollection[i].value;
		}
	}
	if(required && !itemSelected)
		alert('You must make a selection for "'+ fieldLabel +'".\nThank You.');
	return selection;
}

function IsValidTime(formField,fieldLabel,required) {
// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.
	if (required && !validRequired(formField,fieldLabel))
		return false;
	var timeStr = formField.value;

	var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
	var sp = timeStr.length - timeStr.lastIndexOf(" ")

	var matchArray = timeStr.match(timePat);
	if (matchArray == null || sp!=3) {
		alert(fieldLabel + "\nTime is not in a valid format.\n\nHH:MM AM/PM\n\nAnd make sure there are no spaces at the end.\nThank You.");
		formField.focus();
		return false;
	}
	hour = matchArray[1];
	minute = matchArray[2];
	second = matchArray[4];
	ampm = matchArray[6];

	if (second=="") { second = null; }
	if (ampm=="") { ampm = null }

	if (hour < 1  || hour > 12) {
		alert(fieldLabel + "\nHour must be between 1 and 12.\nThank You.");
		formField.focus();
		return false;
	}
	if (minute<0 || minute > 59) {
		alert (fieldLabel + "\nMinute must be between 0 and 59.\nThank You.");
		formField.focus();
		return false;
	}
	if (second != null && (second < 0 || second > 59)) {
		alert (fieldLabel + "\nSecond must be between 0 and 59.\nThank You.");
		formField.focus();
		return false;
	}
	if (ampm == null) {
		alert(fieldLabel + "\nYou must specify AM or PM.\nThank You.");
		formField.focus();
		return false;
	}
	return true;
}

function isEmailAddr(email)
{
  var result = true;
  var theStr = new String(email);
  var invalidChars = "*|,\":<>[]{}`\';()&$#%";
  if(theStr.indexOf("@")==-1 || theStr.indexOf(".")==-1) {
	result = false;
  }
  if(theStr.lastIndexOf(".") < theStr.indexOf("@")) {
	result = false;
  }
  if(theStr.indexOf(" ")>-1) {
	result = false;
  }
  for (var i = 0; i < theStr.length; i++) {
	if (invalidChars.indexOf(theStr.charAt(i)) != -1){
	  result = false;
	}
  }
  var theStr_substrings = theStr.split("@"); 
  if(theStr_substrings.length!=2) { 
	result = false;
  }
  return result;
}

function validMustMatch(formField1,fieldLabel1,formField2,fieldLabel2)
{
	var result = true;

	if (formField1.value != formField2.value)
	{
		alert('The "' + fieldLabel1 + '" field must match the "' + fieldLabel2 + '" field.\nThank You.');
		formField1.focus();
		result = false;
	}
	
	return result;
}

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

	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.\nThank You.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function validRequiredCombo(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "0" || formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.\nThank You.');
		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 != "" && !isEmailAddr(formField.value))
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com\nThank You.");
		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.\nThank You.');
			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.\nThank You.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}

function validDate(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result  && formField.value != "")
 	{
 		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.\nThank You.');
			formField.focus();		
		}
	} 
	
	return result;
}

function trim(inputString, removeChar){
	var returnString = inputString;
	if (removeChar.length){
		while(''+returnString.charAt(0)==removeChar){
			returnString=returnString.substring(1,returnString.length);
		}
		while(''+returnString.charAt(returnString.length-1)==removeChar){
			returnString=returnString.substring(0,returnString.length-1);
		}
	}
	return returnString;
}