function isValidEmail (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 +")*$");
 var matchArray=emailStr.match(emailPat);
 if (matchArray==null) {
  alert("Email address seems incorrect (check @ and .'s)");
  return false;
 }
 var user=matchArray[1];
 var domain=matchArray[2];
 for (i=0; i<user.length; i++) {
  if (user.charCodeAt(i)>127) {
    alert("Ths username contains invalid characters.");
    return false;
  }
 }
 for (i=0; i<domain.length; i++) {
   if (domain.charCodeAt(i)>127) {
     alert("Ths domain name contains invalid characters.");
     return false;
   }
 }
 if (user.match(userPat)==null) {
  alert("The username doesn't seem to be valid.");
  return false;
 }
 var IPArray=domain.match(ipDomainPat);
 if (IPArray!=null) {
  for (var i=1;i<=4;i++) {
   if (IPArray[i]>255) {
     alert("Destination IP address is invalid!");
     return false;
   }
  }
  return true;
 }
 var atomPat=new RegExp("^" + atom + "$");
 var domArr=domain.split(".");
 var len=domArr.length;
 for (i=0;i<len;i++) {
   if (domArr[i].search(atomPat)==-1) {
     alert("The domain name 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 address must end in a well-known domain or two letter " + "country.");
  return false;
 }
 if (len<2) {
  alert("This address is missing a hostname!");
  return false;
 }
 return true;
}

function isEmpty(s) {
 if ( (s == null) || (s.length == 0) ) return true;
 return ((typeof s=="string")&&(s.search(/^\s*$/)==0));
}

function submit_request_a(form){
/*
 if( isEmpty(form.firstname.value) ){
    alert("Please enter first name.");
    form.firstname.focus();
    return false;
 } 
 if( isEmpty(form.lastname.value) ){
    alert("Please enter last name.");
    form.lastname.focus();
    return false;
 }
*/ 
 if( isEmpty(form.email.value) ){
    alert("Please enter email address.");
    form.email.focus();
    return false;
 } 
 if( isValidEmail(form.email.value) ){   
    form.submit();
 }
}

function submit_request_b(form){
 if( isEmpty(form.fromemail.value) ){
    alert("Please enter from email address.");
    form.fromemail.focus();
    return false;
 } 
 if( isEmpty(form.toemail.value) ){
    alert("Please enter to email address.");
    form.toemail.focus();
    return false;
 } 
 if( isValidEmail(form.fromemail.value) && isValidEmail(form.toemail.value)){   
    form.submit();
 }
}





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