// JavaScript Document

function validate_required(field)
{
	with (field)
	{
	if (value==null||value=="")
	  {
	  return false;
	  }
	else {
	  return true;
	  }
	}
}
function validate_email(field)
{
	with (field)
	{
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2) 
		  {return false;}
		else {return true;}
	}
}

// PHONE VALIDATION
// 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 trim(s)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
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){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function validate_phone(field){
	var Phone=field
	
	if ((Phone.value==null)||(Phone.value=="")){
		return false
	}
	if (checkInternationalPhone(Phone.value)==false){
		return false
	}
	return true
 }
function validate_contact(thisform)
{
	var errorMsg = "";
	var errors = 0;
	with (thisform) {
		if (validate_required(name)==false) {
			errorMsg = errorMsg + "You must enter your name.\n";
			errors++;
		}
		if (validate_email(email)==false) {
			errorMsg = errorMsg + "You must enter a valid email address.\n";
			errors++;
		}
		if (validate_phone(phone)==false) {
			errorMsg = errorMsg + "You must enter a valid phone number.\n";
			errors++;
		}
		// errorMsg  = errorMsg + "Errors = " + errors;
	}
	if(errors > 0) {
		alert(errorMsg);
		return false;
	} 
}