/**
    * DHTML phone number validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
    */

    // 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(address) {
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
        if(reg.test(address) == false) {
            return false;
     }
}