var digits = "0123456789";
var phoneNumberDelimiters = "()- ";

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++)
    {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}
function trim(s)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        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 echeck(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 E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}
	
	function validate()
   {
    if(document.send_mail.Name.value=='')
	{
	alert('Please Enter Your Name.');
	document.send_mail.Name.focus();
	return false;
	}
	if(document.send_mail.Address.value=='')
	{
	alert('Please Enter Your Address.');
	document.send_mail.Address.focus();
	return false;
	}
	if(document.send_mail.Country.value=='null')
	{
	alert('Please Enter Your Country.');
	document.send_mail.Country.focus();
	return false;
	}
	var emailID=document.send_mail.EmailId
	if(document.send_mail.EmailId.value=='')
	{
	alert('Please Enter Your Valid Email ID.');
	document.send_mail.EmailId.focus();
	return false;
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	if(document.send_mail.PhoneNumber.value=='')
	{
	alert('Please Enter Your Phone Number.');
	document.send_mail.PhoneNumber.focus();
	return false;
	}
	if (checkInternationalPhone(PhoneNumber.value)==false){
		alert("Please Enter a Valid Phone Number")
		PhoneNumber.value=""
		PhoneNumber.focus()
		return false
	}
	if(document.send_mail.TravellinginMonth.value=='null')
	{
	alert('Please Enter Travellingi n Month');
	document.send_mail.TravellinginMonth.focus();
	return false;
	}
	if(document.send_mail.TravellinginYear.value=='null')
	{
	alert('Please Enter Travelling in Year');
	document.send_mail.TravellinginYear.focus();
	return false;
	}
	if(document.send_mail.Durationofstay.value=='null')
	{
	alert('Please Enter Duration of Stay');
	document.send_mail.Durationofstay.focus();
	return false;
	}
	if(document.send_mail.TravelPreferences.value=='')
	{
	alert('Please Enter Your Comments.');
	document.send_mail.TravelPreferences.focus();
	return false;
	}
	if (document.send_mail.TravelPreferences.value.length<30)
    {
	alert("Atleast Type Your 30 Words Comments.");
	return false;
	}