function validateTelephone( strValue ) {
  // non-digit characters which are allowed in phone numbers
  var phoneNumberDelimiters = "+()- ";
  // Minimum no of digits in an international phone no.
  var minDigitsInIPhoneNumber = 10;
  s=stripTelDelim(strValue,phoneNumberDelimiters);
  return (validateInteger(s) && s.length >= minDigitsInIPhoneNumber);
}


function stripTelDelim(s, delims) {   
  var i;
  var returnString = "";
  // Search through string's characters one by one.
  // If character is not a telephone delimiter, append to returnString.
  for (i = 0; i < s.length; i++) {   
      // Check that current character isn't whitespace.
      var c = s.charAt(i);
      if (delims.indexOf(c) == -1) returnString += c;
  }
  return returnString;
}


function validateNotEmpty( strValue ) {
/************************************************
DESCRIPTION: Validates that a string is not all
  blank (whitespace) characters.

PARAMETERS:
   strValue - String to be tested for validity

RETURNS:
   True if valid, otherwise false.
*************************************************/
   var strTemp = strValue;
   strTemp = trimAll(strTemp);
   if(strTemp.length > 0) return true;
   return false;
}


function trimAll( strValue ) {
/************************************************
DESCRIPTION: Removes leading and trailing spaces.

PARAMETERS: Source string from which spaces will
  be removed;

RETURNS: Source string with whitespaces removed.
*************************************************/
	var objRegExp = /^(\s*)([\W\w]*)(\b\s*$)/;

	//check for leading &amp; trailing spaces
	if(objRegExp.test(strValue)) {
       //remove leading and trailing whitespace characters
       strValue = strValue.replace(objRegExp, '$2');
    }
	return strValue;
}


function validateEmail( strValue) {
/************************************************
DESCRIPTION: Validates that a string contains a
  valid email pattern.
*************************************************/
  var objRegExp = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
  return objRegExp.test(strValue);
  //check for valid email
  return objRegExp.test(strValue);
}

function  validateNumeric( strValue ) {
/******************************************************************************
DESCRIPTION: Validates that a string contains only valid numbers.
PARAMETERS:
   strValue - String to be tested for validity
RETURNS:
   True if valid, otherwise false.
******************************************************************************/
  var objRegExp  =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
  //check for numeric characters
  return objRegExp.test(strValue);
}

// check to see if input is alphanumeric
function isAlphaNumeric(val) {
	return val.match(/^[a-zA-Z0-9]+$/);	
}

function  validatePassword( strValue ) {
  return isAlphaNumeric(strValue);
}

function validateInteger( s ) {
/************************************************
DESCRIPTION: Validates that a string contains only
    valid integer number.

PARAMETERS:
   strValue - String to be tested for validity

RETURNS:
   True if valid, otherwise false.
******************************************************************************/
  //var objRegExp = /^\d+$/;
  //return objRegExp.test(strValue);
  
  if(s.length == 0) return false;
  
  var i; var digits = "0123456789";

  for (i = 0; i < s.length; i++) {   
      // Check that current character is number.
      var c = s.charAt(i);
      if (digits.indexOf(c) == -1) return false;
  }
  // All characters are numbers.
  return true;
}

function  validateDate( strDay, strMonth, strYear ) {
/******************************************************************************
DESCRIPTION: Validates that a number combinations provide a valid date
PARAMETERS:
   strDay - Date day
   strMonth - Date month   
   strYear - Date year
RETURNS:
   True if valid, otherwise false.
******************************************************************************/

	var isValid = true;
	
	if(!validateInteger(strDay)) isValid=false;
	if(validateInteger(strMonth)) {
		if(strMonth<1 || strMonth>12) isValid=false;
	}
	else
		isValid=false;
	if(!validateInteger(strYear)) isValid=false;
	
	var today = new Date();
	if(strYear < 1900 || strYear > today.getFullYear()) isValid=false;

	if(isValid) {
		switch(strMonth) {
			case 1: if(strDay<1 || strDay>31) isValid=false;break;
			case 2: if(strDay<1 || strDay>29) isValid=false;break;
			case 3: if(strDay<1 || strDay>31) isValid=false;break;
			case 4: if(strDay<1 || strDay>30) isValid=false;break;				
			case 5: if(strDay<1 || strDay>31) isValid=false;break;				
			case 6: if(strDay<1 || strDay>30) isValid=false;break;
			case 7: if(strDay<1 || strDay>31) isValid=false;break;
			case 8: if(strDay<1 || strDay>31) isValid=false;break;
			case 9: if(strDay<1 || strDay>30) isValid=false;break;
			case 10: if(strDay<1 || strDay>31) isValid=false;break;				
			case 11: if(strDay<1 || strDay>30) isValid=false;break;				
			case 12: if(strDay<1 || strDay>31) isValid=false;break;							
		}
	}
	return isValid;
}


//onkeypress = "return numbersOnly(event);"
function numbersOnly(e) {
	var unicode=e.charCode? e.charCode : e.keyCode
	if (unicode!=8){ //if the key isn't the backspace key (which we should allow)
	if (unicode<48||unicode>57) //if not a number
	return false; //disable key press
	}
	return true;
}

function hitEnter() {
	if (document.all){
		if (event.keyCode == 13) {
			event.returnValue=false; 
			event.cancel = true;
			return true;
		}
		else
			return false;
	}
}