function checkEmail()
{
  var tlds = ".gov";
  
var email = document.theForm.client_email.value;
  email = email.replace(/^\s+|\s+$/, '');
  var rex = new RegExp("^[A-Za-z0-9\.\-_]+@[A-Za-z0-9\.\-]+\.[A-Za-z]+$")
  var endofString = email.split('.');
  var ending = endofString.length - 1;
  var tld = endofString[ending];
  if (! email.match(rex)) {
    alert('Invalid email address format. Correct this field and click Continue again.');
    return false;
  }

  else {
    return true;
  }
}