function regCheck (theForm) {

var checkOK = "<>?/\{}[]()*@!=+&%#";
var checkStr = theForm.UFirstName.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"First Name\" field.");
theForm.UFirstName.focus();
return (false);
}
}
if ((theForm.UFirstName.value == '')  || (theForm.UFirstName.value == '0') || (theForm.UFirstName.value < '0')) {
     alert('Please enter your first name!');
        return false;
}


var checkOK = "<>?/\{}[]()*@!=+&%#";
var checkStr = theForm.ULastName.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"Last Name\" field.");
theForm.ULastName.focus();
return (false);
}
}
if ((theForm.ULastName.value == '')  || (theForm.ULastName.value == '0') || (theForm.ULastName.value < '0')) {
     alert('Please enter your last name!');
        return false;
}


var checkOK = "<>?/\{}[]()*@!=+&%";
var checkStr = theForm.UPhoneNumber.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"Phone Number\" field.");
theForm.UPhoneNumber.focus();
return (false);
}
}

var checkOK = "<>?/\{}[]*@!=+&%";
var checkStr = theForm.UAddress.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"Address\" field.");
theForm.UAddress.focus();
return (false);
}
}

var checkOK = "<>?/\{}[]*@!=+&%";
var checkStr = theForm.UCity.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"City\" field.");
theForm.UCity.focus();
return (false);
}
}

var checkOK = "<>?/\{}[]*@!=+&%";
var checkStr = theForm.UZip.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"Zip\" field.");
theForm.UZip.focus();
return (false);
}
}

var checkOK = "<>?/\{}[]*@!=+&%";
var checkStr = theForm.UCompanyName.value;
for (i = 0;  i < checkStr.length;  i++)
{
ch = checkStr.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
{
alert("You have entered invalid characters in the \"Company\" field.");
theForm.UCompanyName.focus();
return (false);
}
}


if ((theForm.UEMail.value == '')  || (theForm.UEMail.value == '0') || (theForm.UEMail.value < '0')) {
     alert('Please enter your email address!');
        return false;
}


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=theForm.UEMail.value.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].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;
}