// 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 + "+";
//var validWorldPhoneChars = phoneNumberDelimiters;
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 6;

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);
//		alert(bag.indexOf(c));
        if(bag.indexOf(c) == -1) 
			returnString += c; 
    }
    return returnString;
}

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

function Validate_phone_number(Phone)
{	
	if((Phone==null)||(Phone==""))
	{
		alert("Please Enter your Phone Number")		
		return false
	}
	if(checkInternationalPhone(Phone)==false)
	{
		alert("Please Enter a Valid Phone Number")		
		return false
	}
	return true
}

function Validate_fax_number(Fax)
{	
	if((Fax==null)||(Fax==""))
	{
		alert("Please Enter your Fax Number")		
		return false
	}
	if(checkInternationalPhone(Fax)==false)
	{
		alert("Please Enter a Valid Fax Number")		
		return false
	}
	return true
}