function getObById(id)
{
	if (document.layers) //Netscape 4
		return eval('document.' + id);
	else if (navigator.userAgent.indexOf("Opera") != -1) //Opera
		return eval("document.all."+id);
	else // all others . . .
		return document.getElementById(id);
}


function validate(){

if ((getObById('name').value == "") || (getObById('name').value == " "))
{
	alert("Please enter your name.");
	getObById('name').focus();
	return (false);
}

if (getObById('email').value == "")
{
	alert("Please enter your email address.");
	getObById('email').focus();
	return (false);
}

if (emailCheck(getObById('email').value) != true)
{
	//alert("Please enter a valid email address.");
	getObById('email').focus();
	return (false);
}

if (getObById('comment').value == "")
{
	alert("Please enter your comment");
	getObById('comment').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)
{
	alert("Please check your email address.")
	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("The domain's IP address doesn't seem to be valid.")
		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].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;
}