function formCheck(emailStr, messageStr) {

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("Your email address is missing or incorrectly spelled (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("Your email emaddress contains invalid characters.");

return false;

   }

}

for (i=0; i<domain.length; i++) {

if (domain.charCodeAt(i)>127) {

alert("Your email domain name contains invalid characters.");

return false;

   }

}

if (user.match(userPat)==null) {

alert("Your email doesn't seem to be valid - check your spelling.");

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("Your email address does not seem to be valid - check your spelling, including wrong use of commas, or a full point [.] at the end of the address .");

return false;

   }

}

if (checkTLD && domArr[domArr.length-1].length!=2 && 

domArr[domArr.length-1].search(knownDomsPat)==-1) {

alert("Your email address must end in a well-known domain or two letter " + "country.");

return false;

}

if (len<2) {

alert("Your email address is missing a hostname - check spelling. Or you may have added a blank space at the end of the address - backspace to remove this.");

return false;

}

if (messageStr.length < 5) {

alert("Your message must be longer than 5 characters.");

return false;

}

return true;

}