function trimLeft(s) {
	var whitespaces = " \t\n\r";
	for(n = 0; n < s.length; n++) { if (whitespaces.indexOf(s.charAt(n)) == -1) return (n > 0) ? s.substring(n, s.length) : s; }
	return("");
}

function trimRight(s){
	var whitespaces = " \t\n\r";
	for(n = s.length - 1; n  > -1; n--) { if (whitespaces.indexOf(s.charAt(n)) == -1) return (n < (s.length - 1)) ? s.substring(0, n+1) : s; }
	return("");
}

function trim(s) {return ((s == null) ? "" : trimRight(trimLeft(s))); }

function isBlank(field, strBodyHeader) {
	strTrimmed = trim(field.value);
	defaultVal = strBodyHeader+'*';
	if(strTrimmed==defaultVal) strTrimmed = '';
	if (strTrimmed.length > 0) return false;
	alert("\"" + strBodyHeader + "\" is a required field. Please type a value.");
	//field.focus();
	return true;
}

var emailPat=/^(.+)@(.+)$/;
var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
var validChars="\[^" + specialChars + "\]";
var quotedString="(\"[^\"]*\")";
var ipDomainPat=/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var atom=validChars + '+';
var word="(" + atom + "|" + quotedString + ")";
var atomPat=new RegExp("^" + atom + "$");
var localPat=new RegExp("^" + word + "(\\." + word + ")*$");
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
var complexPat=/^(.+)<(.+)>$/;
var commentPat=/(.*)\((.*)\)(.*)$/;
function simpleEmailCheck (emailStr) {
	if(emailStr == "") return false;
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) return false;
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) return false;
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) return false;
	}
	if( !checkUser(user)) 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 domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if( !checkDomain(domArr[i]) ) return false;
	}
	return true;
}
function checkDomain(domain){
	var validDomain = true;
	var domainArray = domain.match(commentPat);
	if( domainArray == null ) {
		if( domain.match(atomPat)==-1) validDomain = false;
	}
	else {
		for(var i=1; i<domainArray.length; i++){
			if( domainArray[i] != "" && !checkDomain(domainArray[i]) ) validDomain = false;
		}
	}
	return validDomain;
}
function checkUser(user){
	var validUser = true;
	var userArray = user.match(commentPat);
	if( userArray == null ){
		if (user.match(localPat)==null)  validUser = false;
	}
	else {
		for(var i=1; i<userArray.length; i++) {
			if( userArray[i] != "" && !checkUser(userArray[i]) ) validUser = false;
		}
	}
	return validUser;
}
function isEmail(field, strBodyHeader){
	emailStr = field.value;
	if(emailStr.length == 0) return true;
	if(!complexEmailCheck(emailStr)) {
		alert("Error: Invalid email address. Please type a valid email address for field " + strBodyHeader + ".");
		field.focus();
		return false;
	}
	return true;
}
function complexEmailCheck(emailStr){
	if(emailStr == "") return false;
	if(emailStr.indexOf("@")==-1) return false;
	var matchArray=emailStr.match(complexPat);
	if (matchArray==null) {
		if( simpleEmailCheck(emailStr) ) return true;
		else return false;
	}
	var phrase=matchArray[1];
	var routeAddr=matchArray[2];
	if( !simpleEmailCheck(routeAddr) ) return false;
	else return true;
}