<!--
function checkfield(echoForm) {
var message = "";

if (echoForm.feedback) {

	if (echoForm.FirstName.value == "") {message += "\n  - First Name";}
	if (echoForm.LastName.value == "") {message += "\n  - Last Name";}
	if (!emailCheck(echoForm.Email.value)) {message += "\n  - Email Address";}

}


if (echoForm.contact) {

	if (echoForm.FirstName.value == "") {message += "\n  - First Name";}
	if (echoForm.LastName.value == "") {message += "\n  - Last Name";}
	if (!emailCheck(echoForm.Email.value)) {message += "\n  - Email Address";}
	if (echoForm.Message.value == "") {message += "\n  - Message";}
	
}

if (message != "") {
		if (message != "") {message = "The following fields require valid entries: " + message;}
		alert(message);
		return false;
		}	
return true;
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
function isNumber(argvalue) {

	var g=".0123456789";
	var s=argvalue
	var good=true;
	var n="";

	  for(var i=0;i< s.length;i++)
	  {
		c = s.charAt(i);
		for(j=0;j< g.length;j++)
			if(c == g.charAt(j))
			break;
				
			if(j == g.length)
			{
			good=false;
			break;
			}
			n += c;
	  }
		  
	  if(!good) {
	  return(false);
	  } else {
	  return(true);
	  }
  
}	
 
//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////

function isInteger(argvalue) {
	argvalue = argvalue.toString();
	
	if (argvalue.length == 0)
	return false;
	
	for (var n = 0; n < argvalue.length; n++) {
		var oneChar = argvalue.charAt(n);
		if ( n == 0 && (oneChar == "+" || oneChar ==
		"-")) continue;
		if (oneChar < "0" || oneChar >
		"9")
		return false;
	}
	return true;
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////

function emailCheck(emailStr) {
/* 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=emailStr.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;
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////

//-->