// JavaScript Document

function TrimString(sInString)
{
  sInString = sInString.replace(/^\s+/g, "" );// strip leading
  return sInString.replace( /\s+$/g, "" );// strip trailing
}

function CheckBlank(txtElement,fieldName)
{
	if (TrimString(txtElement.value) == "") 
	{
		alert ("Please Enter " + fieldName);
		txtElement.focus();
		return false;
	}
	return true;
}


function checkEmail(txtElement,fieldName,allowEmpty)
{
	var exclude=/[^@\-\.\w\_]|^[_@\.\-]|[\._\-]{2}|[@\.]{2}|(@)[^@]*\1/;
	var check=/@[\w\-]+\./;
	var checkend=/\.[a-zA-Z]{2,3}$/;
	var strEmail = txtElement.value
	var email_array=strEmail.split(",");
	
	if(allowEmpty == false && txtElement.value.length == 0)
	{
		alert("Please enter '" + fieldName + "'");
		txtElement.focus()
		return false;
	}

	if(allowEmpty == true && txtElement.value.length == 0)
	{
		//empty value is allowed
		return true;
	}
	else 
	{
		var email_num=0;
		var checkEmail;
		while (email_num < email_array.length)
		{
				var trimemail = TrimString(email_array[email_num]);
				//alert("email=" + hello);
				//alert("email=" + email_array[email_num]);
				if(((trimemail.search(exclude) != -1) || 
					(trimemail.search(check)) == -1)   ||	
					(trimemail.search(checkend) == -1))
				{
					checkEmail = "false";
				}
				else
				{
					checkEmail = "true";
				}
				//alert(email_array[email_num]);
				email_num++;
				if(checkEmail == "false")
				{
					alert("Incorrect email address!");
					txtElement.focus()
					return false;
				}
				else 	
					return true;				
		}		
	}
}

// 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 ValidateInput()
{
	if (!CheckBlank(document.form1.aname,'Name')) return false;
	if (!CheckBlank(document.form1.bemail,'Email'))return false;	
	if(!checkEmail(document.form1.bemail,'Email',false))return false;
	var Phone=document.form1.cphone
	
	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
	}
	if (!CheckBlank(document.form1.imgid,'code'))return false;	
	return true;
}