/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
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(dtStr){
	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 date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid 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)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function hideElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = 'none';
}


function showElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = '';
}

function confirmDelete()
{
    var agree=confirm("Are you sure you wish to delete this entry?");
    if (agree)
        return true;
    else
        return false;
}

	
function IsBlank(field)
{
	with (field)
	{
		if (value==null||value=="")
		  return true;
		else 
			return false;
	}
	
}
	
function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
}

function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}	


function IsValidTime(timeStr) {
// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.

	var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
	
	var matchArray = timeStr.match(timePat);
	if (matchArray == null) {
		alert("Time is not in a valid format.");
		return false;
	}
	hour = matchArray[1];
	minute = matchArray[2];
	second = matchArray[4];
	ampm = matchArray[6];
	
	if (second=="") { second = null; }
	if (ampm=="") { ampm = null }
	
	if (hour < 0  || hour > 23) {
		alert("Hour must be between 1 and 12. (or 0 and 23 for military time)");
		return false;
	}
	if (hour <= 12 && ampm == null) {
	if (confirm("Please indicate which time format you are using.  OK = Standard Time, CANCEL = Military Time")) {
		alert("You must specify AM or PM.");
		return false;
	   }
	}
	if  (hour > 12 && ampm != null) {
		alert("You can't specify AM or PM for military time.");
		return false;
	}
	if (minute<0 || minute > 59) {
		alert ("Minute must be between 0 and 59.");
		return false;
	}
	if (second != null && (second < 0 || second > 59)) {
		alert ("Second must be between 0 and 59.");
		return false;
	}
	return true;
}
	
function Validate_String(string, return_invalid_chars) {
		  valid_chars = '1234567890-_.^~abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
		  invalid_chars = '';
		  if(string == null || string == '')
		     return(true);
		
		  //For every character on the string.   
		  for(index = 0; index < string.length; index++) {
		    char = string.substr(index, 1);                        
		     
		    //Is it a valid character?
		    if(valid_chars.indexOf(char) == -1) {
		      //If not, is it already on the list of invalid characters?
		      if(invalid_chars.indexOf(char) == -1) {
		        //If it's not, add it.
		        if(invalid_chars == '')
		          invalid_chars += char;
		        else
		          invalid_chars += ', ' + char;
		      }
		    }
		  }
		            
		  //If the string does not contain invalid characters, the function will return true.
		  //If it does, it will either return false or a list of the invalid characters used
		  //in the string, depending on the value of the second parameter.
		  if(return_invalid_chars == true && invalid_chars != '') {
		    last_comma = invalid_chars.lastIndexOf(',');
		    if(last_comma != -1)
		      invalid_chars = invalid_chars.substr(0, $last_comma) + 
		      ' and ' + invalid_chars.substr(last_comma + 1, invalid_chars.length);
		    return(invalid_chars);
		    }
		  else
		    return(invalid_chars == ''); 
		}
		
function Validate_Email_Address(email_address) {


  //Assumes that valid email addresses consist of user_name@domain.tld
	
	/*
  at = email_address.indexOf('@');
  dot = email_address.indexOf('.');

  if(at == -1 || 
    dot == -1 || 
    dot <= at + 1 ||
    dot == 0 || 
    dot == email_address.length - 1)
    return(false);
     
  user_name = email_address.substr(0, at);
  domain_name = email_address.substr(at + 1, email_address.length);                  

  if(Validate_String(user_name) === false || 
    Validate_String(domain_name) === false)
    return(false);                     

  return(true);
  */
  
    var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	
	if(email_address.match(emailRegEx))
		return true;
	else
		return false;
  
  
}


function CountMe(theSelect)
{
   var i=0;
   var numSelected = 0;

   for (i=0; i<theSelect.length; i++)
   {
        if(theSelect[i].selected)
        {
             numSelected = numSelected + 1;
        }
   }
	return numSelected
}


function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}
function ltrim(stringToTrim) {
	return stringToTrim.replace(/^\s+/,"");
}
function rtrim(stringToTrim) {
	return stringToTrim.replace(/\s+$/,"");
}