function emailCheck(emailStr)
{

/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */

var checkTLD = 1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat = /^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* 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 " + emailStr + " seems incorrect (check @ and .'s)");
	return false;
}

var user = matchArray[1];
var domain = matchArray[2];

// Start by checking that only basic ASCII characters are in the strings (0-127).

for (i = 0; i  <user.length; i++)
{
	if (user.charCodeAt(i) > 127)
	{
		alert("Email address " + emailStr + " contains invalid characters.");
		return false;
	}
}

for (i = 0; i < domain.length; i++)
{
	if (domain.charCodeAt(i) > 127)
	{
		alert("Email address " + emailStr + " contains invalid characters.");
		return false;
	}
}

// See if "user" is valid 

if (user.match(userPat) == null)
{
	// user is not valid

	alert("The username in " + emailStr + " 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 in " + emailStr + ".");
			return false;
		}
	}
	
	return true;
}

// Domain is symbolic name. Check if it's valid.
 
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 in " + emailStr + ".");
		return false;
	}
}

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

if (checkTLD && domArr[domArr.length-1].length != 2 && domArr[domArr.length-1].search(knownDomsPat) == -1)
{
	alert("The address " + emailStr + " must end in a well-known domain or two letter " + "country.");
	return false;
}

// Make sure there's a host name preceding the domain.

if (len < 2)
{
	alert("Email address " + emailStr + " is missing a hostname!");
	return false;
}

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

function trim(varStr) {
	return varStr.replace(/^\s+|\s+$/g,"");
}

function MouseHover(x) {
	if (typeof(x) == "undefined") {
		x = this;
	}
	
	x.oldClassName = x.className;
	x.className = x.className + "Hover";
}

function MouseOffHover(x) {
	if (typeof(x) == "undefined") {
		x = this;
	}
	
	x.className = x.oldClassName;
}

function changeLinkColour(colour, linkElement) {
    document.getElementById(linkElement).style.color = colour;
}

function changeLinkColourBack(linkElement) {
    document.getElementById(linkElement).style.color = "";
}

function keyPressed(e, action){
    var keyPressed;
    if(window.event)
        keyPressed = window.event.keyCode; // IE
    else
        keyPressed = e.which; // Firefox

    if (keyPressed == 13) {
        if(action == "Search"){
            searchAnimals();
        }
    }
}

function keepSessionAlive() {
    jsrsExecute(Application["ApplicationPath"] + "/ServerScript/Default.aspx", null, "KeepSessionAlive", null);
}

function checkRaceGrade(minGrade, maxGrade) {
    if (minGrade.length == 0 || maxGrade.length == 0) {
        return true;
    }

    if (minGrade > maxGrade) {
        alert("Min grade must be less than max grade");
        return false;
    }

    if ((minGrade == 0 && maxGrade != 0) || (maxGrade == 0 && minGrade != 0)) {
        alert("You cannot combine a 0 grade race with any other grade");
        return false;
    }

    return true;
}

function getClassName() {
    var minGrade = document.getElementById("txtMinGrade").value
    var maxGrade = document.getElementById("txtMaxGrade").value

    var raceClass = getSelectTextValue(document.getElementById("cboRaceClass"));
    if (raceClass != "Grade") {
        document.getElementById("spanClassName").innerText = ""
        return;
    }

    var className = "";
    var distanceOptions = document.getElementById("cboDistance");
    var distanceName = distanceOptions.options[distanceOptions.selectedIndex].getAttribute("DistanceName");

    if (minGrade.length > 0 && maxGrade.length > 0) {
        className = 'C' + minGrade

        if (minGrade != maxGrade) {
            className = className + '/' + maxGrade
        }
        className = className + distanceName;

        if (document.getElementById("chkHurdles").getAttribute("Checked")) {
            className = className + "h"
        }

        if (document.getElementById("chkHeat").getAttribute("Checked")) {
            className = className + "q"
        }

        if (document.getElementById("chkFinal").getAttribute("Checked")) {
            className = className + "f"
        }

    }
    document.getElementById("spanClassName").innerText = className

}

function aRaceBook_onclick(dayID) {
    if (dayID > 0) {
        jsrsExecute(Application["ApplicationPath"] + "/ServerScript/Meeting.aspx", aRaceBook_onclick_Return, "GeneratePDFRaceBook", new Array("" + dayID));
    }
}

function aRaceBook_onclick_Return() {

}