function Left(str, len){
	return str.slice(0,len)
}
function Right(str, len){
	return str.slice(len,str.length)
}

function Mid(str,start,len){
	return str.slice(start,start+len)
}

function formatCurrency(sText){
	
	var lPounds = Math.floor(sText)
	var lPence = Math.round((sText - lPounds) * 100)
	
	lPence = lPence+''
	
	if (lPence.length == 1){
		lPence = '0' + lPence
	}
	
	return '£' + formatNumber(lPounds) + "." + lPence
}

function formatNumber(sText){
	
	sText = sText + ''
	
	var sResult = ""
	var lCount = 0
	
	for (var i = sText.length-1;i>=0;i--){
			
		if (lCount == 3){
			sResult = "," + sResult
			lCount = 0
		}
		sResult = sText.charAt(i) + sResult
		lCount++
	}
	
	return sResult
}

function isCurrency(sText){
   var ValidChars = "0123456789.£";
   var isValid=true;
   var Char;

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

	return isValid;
   
}


function isNumeric(sText){
   var ValidChars = "0123456789.";
   var isValid=true;
   var Char;

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

	arrDecimalSplit = sText.split('.')
	if (arrDecimalSplit.length > 2){
		isValid = false;
	}
	
	if (Right(sText,1) == '.'){
		isValid = false;
	}
	
	return isValid;
   
}






function isDate(dateStr) {

var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{2,4})$/;
var matchArray = dateStr.match(datePat); // is the format ok?

if (matchArray == null) {
return false;
}

day = matchArray[1]; // p@rse date into variables
month = matchArray[3];
year = matchArray[5];

if (day < 1 || day > 31) {
return false;
}

if (month < 1 || month > 12) { // check month range
return false;
}


if ((month==4 || month==6 || month==9 || month==11) && day==31) {
return false;
}

if (month == 2) { // check for february 29th
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
if (day > 29 || (day==29 && !isleap)) {
return false;
}
}
return true; // date is valid
}


function isTime(sTime){

var sSplit = sTime.split(":")

if (sSplit.length != 2){
	return false;
}

var hours = sSplit[0]
var minutes = sSplit[1]

if (isNumeric(hours) == false){
	return false;	
}
if (isNumeric(minutes) == false){
	return false;	
}

if (hours == ""){
	return false;
}

if (minutes == ""){
	return false;
}

if (hours > 23){
	return false;
}

if (minutes > 59){
	return false;
}

return true;


}

function isEmail(sEmail){
	if (sEmail.indexOf("@") == -1 || sEmail.indexOf(".") == -1){
		return false;
	}else{
		return true;
	}
}