function validate(theForm)
{
 
  if (theForm.name.value == "")
  {
    alert("Please enter a value for the \"Name\" field.");
    theForm.name.focus();
    return (false);
  }

  if (theForm.comments.value == "")
  {
    alert("Please enter your questions or comments.");
    theForm.comments.focus();
    return (false);
  }
   
   if (theForm.reply.value == "")
  {
    alert("Please enter your email address so we may contact you.");
    theForm.reply.focus();
    return (false);
  } else {
    
    /* The following pattern is used to check if the entered e-mail address
       fits the user@domain format.  It also is used to separate the username
       from the domain. */
   var emailPat=/^(.+)@(.+)$/
    /* The following string represents the pattern for matching all special
      characters.  We don't want to allow special characters in the address. 
      These characters include ( ) < > @ , ; : \ " . [ ]    */
   var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
    /* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
   var validChars="\[^\\s" + specialChars + "\]"
    /* The following pattern applies if the "user" is a quoted string (in
       which case, there are no rules about which characters are allowed
       and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
      is a legal e-mail address. */
   var quotedUser="(\"[^\"]*\")"
    /* The following pattern applies for domains that are IP addresses,
       rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
       e-mail address. NOTE: The square brackets are required. */
   var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
    /* The following string represents an atom (basically a series of
       non-special characters.) */
   var atom=validChars + '+'
    /* The following string represents one word in the typical username.
       For example, in john.doe@somewhere.com, john and doe are words.
       Basically, a word is either an atom or quoted string. */
   var word="(" + atom + "|" + quotedUser + ")"
     // The following pattern describes the structure of the user
   var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
    /* The following pattern describes the structure of a normal symbolic
     domain, as opposed to ipDomainPat, shown above. */
   var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


     /* Finally, let's start trying to figure out if the supplied address is
     valid. */

     /* Begin with the coarse pattern to simply break up user@domain into
     different pieces that are easy to analyze. */
   var matchArray=theForm.email.value.match(emailPat)
   if (matchArray==null) {
      /* Too many/few @'s or something; basically, this address doesn't
      even fit the general mould of a valid e-mail address. */
      alert("Email address seems incorrect (check @ and .'s)")
    return false
   }
  var user=matchArray[1]
  var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    alert("The username doesn't seem to be valid.")
    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("Destination IP address is invalid!")
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The domain name doesn't seem to be valid.")
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
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) {
   // the address must end in a two letter or three letter word.
   alert("The address must end in a three-letter domain, or two letter country.")
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="This address is missing a hostname!"
   alert(errStr)
   return false
}

// If we've gotten this far, everything's valid!
return true;
}

} // end function