// 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;
		if (c == "1" && i == 0) 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
//}
// if (checkInternationalPhone(x.value)== false && (x.value == null || x.value =="")){