// JavaScript Document

<!-- SCRIPTS FOR STUN EMAIL SIGNUP FORM -->
<!--
function submitform()  {
	var sErrStr, sFieldName;
	sErrStr = "";
	sFieldName = "";
	var email = trim(document.frm.email.value);
	if (email == "")  {
		sErrStr += "Please Enter Email\n";
		if (sFieldName == "")
			sFieldName = "email";
	}
	else if (!emailCheck(document.frm.email.value))  { 
		sErrStr += "Enter Valid E-mail Address\n"
		if (sFieldName == "")
			sFieldName = "email"
	}


	if (sErrStr != "")
	{
		alert("Following are the required fields:- \n"+sErrStr);
		for (i=0;i<document.frm.elements.length;i++)
		{
			if (document.frm.elements[i].name == sFieldName)
				document.frm.elements[i].focus();
		}
		return false;
	}
		return true;
}
function emailCheck(emailStr)
{
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	if (user.match(userPat)==null) {
	    return false
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
		    if (IPArray[i]>255) {
				return false
		    }
	    }
	    return true
	}
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		return false
	}
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	if (domArr[domArr.length-1].length<2 ||
	    domArr[domArr.length-1].length>4) {
		return false
	}
	if (len<2) {
	   return false
	}
	return true;
}

function ltrim(s)
{
	return s.replace(/^\s*/,"")
}

function rtrim(s)
{
	return s.replace(/\s*$/,"");
}

function trim(s)
{
	return rtrim(ltrim(s));
}
function isDigit(c)
{   return ((c >= "0") && (c <= "9"))
}
function isEmpty(s)
{   
	s=trim(s);
	return ((s == null) || (s.length == 0))
}

function warnEmpty (theField, s)
{   
	theField.focus();
	alert("Please enter " +s);
	return false;
}


function checkEmpty (theField, s)
{
   if(isEmpty(theField.value)) return warnEmpty (theField, s);
   else return true;
}


function isWhitespace (s)

{   var i;

	var whitespace = " \t\n\r";
    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);

        if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}
function isInteger (s)

{   var i;

    if (isEmpty(s)) 
       if (isInteger.arguments.length == 1) return defaultEmptyOK;
       else return (isInteger.arguments[1] == true);

    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);

        if (!isDigit(c)) return false;
    }

    // All characters are numbers.
    return true;
}
//-->