function validate() 
{	
	var valid = true;	
	var realname = document.getElementById("realname");
	var email = document.getElementById("email");
	var phone = document.getElementById("PhoneNumber");
	var country = document.getElementById("country");
	var address = document.getElementById("Address");
	
	/* check to ensure details are entered */
	if (realname.value == "")
	{
		valid = false;
		realname.className += " error";
	}
	else realname.className = "";
	
	if (address.value == "")
	{
		valid = false;
		address.className += " error";
	}
	else address.className = "";
	
	if (email.value == "")
	{
		valid = false;
		email.className += " error";
	}
	else if (email.value != "")
	{
		var supEmail = email.value;
		var emLen = supEmail.length;
		var posAt = supEmail.indexOf('@')
		var posDot = supEmail.lastIndexOf('.')
		if((emLen < 7) || (posAt < 1) || (posDot <= (posAt + 1)) || (posDot >= (emLen - 1))){
			valid = false;
			email.className += " error";
		}
	}
	else {email.className = "";}
	
	
	if (country.selectedIndex == 0) 
	{
		valid = false;
		country.className += " error";
	}
	else {country.className = "";}
	
	if ((phone.value==null)||(phone.value=="")){
		valid = false;
		phone.className += " error";
	}
	if (checkInternationalPhone(phone.value)==false){
		valid = false;
		phone.className += " error";
	}
	else {phone.className = "";}
	
	
	
	if (!valid) 
	{
		document.getElementById("errorBox").style.display = "block";
	}
	return valid;
	
	
	
	
}

/**
 * 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 = 8;

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);
}