<!-- Validate required fields -->

// ----------------------------------
// Author  : Tim Wong 
// Company :  Swad Mail  (www.swadhealth.com)
// Function : CheckForm()
// Date   : 28 juni 2004
// ----------------------------------
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) {
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
			return false;
			}
		}
		return true;
	}
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		alert("The domain name doesn't seem to be valid.");
		return false;
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if ((domArr[domArr.length-1] != "info") &&
		(domArr[domArr.length-1] != "name") &&
		(domArr[domArr.length-1] != "arpa")) {
			if (domArr[domArr.length-1].length<2 || 
				domArr[domArr.length-1].length>3) {
					alert("The address must end in a three-letter domain, or two letter country.");
					return false;
			}
	}
	if (len<2) {
	   var errStr="This address is missing a hostname!";
	   alert(errStr);
	   return false;
	}
	return true;
}

function ValidateReturnInfo(thisform)
{
	
	if (thisform.invoicenr.value=="")
	{
		alert("Please enter your invoice number");
		return false;
	}
	
	if (thisform.productname.value=="")
	{
		alert("Please enter your product name");
		return false;
	}
	
	if (thisform.FirstName.value==""){	
		alert("Please enter a value for First Name");
		return(false);}
	
	if (thisform.LastName.value==""){	
		alert("Please enter a value for Last Name");
		return(false);}
	
	if (thisform.phone.value==""){	
		alert("Please fill in your phone number");
		return(false);}
	
		if (thisform.returnmessage.value=="")
	{	
		alert("Please tell us why you want to return the product");
		return(false);
	}
	
	
	if (thisform.feedbackmessage.value=="")
	{	
		alert("Please tell us how we can improve our service to serve you better");
		return(false);
	}
		
	if (!emailCheck(thisform.Email.value))
	{
		return false;
	}


	else
	{
		return true;
	}
}

<!-- what's this ? -->
function emailValidation (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) {
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
			return false;
			}
		}
		return true;
	}
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		alert("The domain name doesn't seem to be valid.");
		return false;
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if ((domArr[domArr.length-1] != "info") &&
		(domArr[domArr.length-1] != "name") &&
		(domArr[domArr.length-1] != "arpa")) {
			if (domArr[domArr.length-1].length<2 || 
				domArr[domArr.length-1].length>3) {
					alert("The address must end in a three-letter domain, or two letter country.");
					return false;
			}
	}
	if (len<2) {
	   var errStr="This address is missing a hostname!";
	   alert(errStr);
	   return false;
	}
	return true;
}