function emailCheck (emailStr) {
var checkTLD=1;
var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
var emailPat=/^(.+)@(.+)$/;
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];

for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name in the email address contains invalid characters.");
return false;
   }
}

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 atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
alert("The domain name in the email address does not seem to be valid.");
return false;
   }
}

if (checkTLD && domArr[domArr.length-1].length!=2 &&
domArr[domArr.length-1].search(knownDomsPat)==-1) {
alert("The email address must end in a well-known domain or two letter " + "country.");
return false;
}

if (len<2) {
alert("This email address is missing a hostname!");
return false;
}

return true;
}



function check_req(form) {
   name = form.First_Name.value;
   add1 = form.Address1.value;
   add2 = form.Address2.value;
   city = form.City.value;
   state = form.State.value;
   zip = form.Zip.value;
   email = form.email.value;
   
   if (name == ""){
       alert ("Please enter your Name in the field provided")
       return false;
   }

   if (add1 == ""){
      alert ("Please enter a your Address in the field provided")
      return false;
   }

   if (city == ""){
      alert ("Please enter a your City in the field provided")
      return false;
   }

   if (state == ""){
      alert ("Please choose a State")
      return false;
   }

   if (zip == ""){
      alert ("Please enter a your Zip in the field provided")
      return false;
   }
   
   if(!emailCheck (email)) {
       return false;
   }

   else {
  	return true;
   }
}

function check_membership(form) {
   name = form.First_Name.value;
   add1 = form.Employer_Address.value;
   add2 = form.Home_Address.value;
   email = form.email.value;
   
   if (name == ""){
       alert ("Please enter your Name in the field provided")
       return false;
   }

   if (add1 == ""){
      alert ("Please enter a your Employer Address in the field provided")
      return false;
   }
   
   if (add2 == ""){
      alert ("Please enter a your Home Address in the field provided")
      return false;
   }
   
   if(!emailCheck (email)) {
       return false;
   }

   else {
  	return true;
   }
}