/*
********************************************************************************************************************
************************************* FUNCTION TO CHECK EMAIL ******************************************************
********************************************************************************************************************
*/
function check_email(str) 
{
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	if (str.indexOf(at)==-1){
	   alert("Invalid email address!");
	   return false;
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   alert("Invalid email address!");
	   return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("Invalid email address!");
		return false;
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		alert("Invalid email address!");
		return false;
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("Invalid email address!");
		return false;
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
		alert("Invalid email address!");
		return false;
	 }
	
	 if (str.indexOf(" ")!=-1){
		alert("Invalid email address!");
		return false;
	 }

	 return true					
}

/*
********************************************************************************************************************
************************************* FUNCTION TO CHECK NUMBER *****************************************************
********************************************************************************************************************
*/
// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone)
{
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm()
{
	var Phone=document.frmSample.txtPhone;
	
	if ((Phone.value==null)||(Phone.value=="")){
		alert("Please Enter your Phone Number");
		Phone.focus();
		return false;
	}
	if (checkInternationalPhone(Phone.value)==false){
		alert("Please Enter a Valid Phone Number");
		Phone.value="";
		Phone.focus();
		return false;
	}
	return true;
}

/*
********************************************************************************************************************
************************************* FUNCTION TO CENTER POP UP WINDOW *********************************************
********************************************************************************************************************
*/
function centre_popup()
{
	if (document.all) 
	{ 
		w = document.body.clientWidth; 
		h = document.body.clientHeight; 
	}
	else if (document.layers) 
	{ 
	w = window.innerWidth; 
	h = window.innerHeight; 
	}
	if (window.moveTo) 
	{
		window.moveTo(w/2,h/2);
	}
}

/*
********************************************************************************************************************
********************************** FUNCTION TO CHECK THAT NO SYMBOLS ARE ENTERED ***********************************
********************************************************************************************************************
*/
function checkForSymbols(strng)
{
	var illegalChars = /\W/;
	// allow only letters, numbers, and underscores
	if (illegalChars.test(strng)) 
	{
	   error = "The username contains illegal characters.\n";
	   return false;
	}
	return true;
}

/*
********************************************************************************************************************
************************************* FUNCTION TO CHECK FOR ALPHABETS ONLY *****************************************
********************************************************************************************************************
*/
var numb = '0123456789';
var lwr = 'abcdefghijklmnopqrstuvwxyz';
var upr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

function isValid(parm,val) 
{
	if (parm == "") 
	{
	  return false;
	}
	for (i=0; i<parm.length; i++) 
	{
		if (val.indexOf(parm.charAt(i),0) == -1) 
		{
			return false;
		}
	}
	return true;
}

function isNum(parm) { return isValid(parm,numb); }
function isLower(parm) { return isValid(parm,lwr); }
function isUpper(parm) { return isValid(parm,upr); }
function isAlpha(parm) { return isValid(parm,lwr+upr); }
function isAlphanum(parm) { return isValid(parm,lwr+upr+numb); }


/*
********************************************************************************************************************
************************************* FUNCTION TRIM FUNCTIONS *****************************************
********************************************************************************************************************
*/
function leftTrim(sString) 
{
	while (sString.substring(0,1) == ' ')
	{
		sString = sString.substring(1, sString.length);
	}
	return sString;
}


function rightTrim(sString) 
{
	while (sString.substring(sString.length-1, sString.length) == ' ')
	{
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}

function trimAll(sString) 
{
	while (sString.substring(0,1) == ' ')
	{
		sString = sString.substring(1, sString.length);
	}
	while (sString.substring(sString.length-1, sString.length) == ' ')
	{
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}

/*
********************************************************************************************************************
************************************* CAPITALISE FIRST/ALL LETTERS OF INPUT ****************************************
********************************************************************************************************************
*/

function capitaliseFirst(str) 
{
	val = str;
	newVal = '';
	val = val.split(' ');
	for(var c=0; c < val.length; c++) 
	{
		newVal += val[c].substring(0,1).toUpperCase() + val[c].substring(1,val[c].length) + ' ';
	}
	return newVal;
}