function checkEmail()
{
    if(document.getElementById("txtEmail").value=="")
    {
        document.getElementById("txtEmail").style.background = "pink";
        document.getElementById("txtEmail").focus();
        return false;
    }
    else
    {
        if (!emailCheck("txtEmail")) {
            return false;
        }
        else {
            document.getElementById("txtEmail").style.border = "1px solid #6EA8DB";
        }
    }
    return true;
}

function emailCheck(emailctrl) {
    var emailStr = document.getElementsByName(emailctrl)[0].value;
    document.getElementById("txtEmail").style.background = "white";
   
    /* 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|COM|net|NET|ORG|org|edu|EDU|int|INT|mil|MIL|gov|GOV|arpa|ARPA|biz|BIZ|aero|AERO|name|NAME|coop|COOP|info|INFO|pro|PRO|museum|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. */
        if (emailctrl == "txtEmail") {
            document.getElementById("txtEmail").focus();
            document.getElementById("txtEmail").style.background = "pink";
        }
        
        alert("Email address 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) {
            if (emailctrl == "txtEmail") {
                document.getElementById("txtEmail").focus();
                document.getElementById("txtEmail").style.background = "pink";
            }
            else 
            alert("Ths username contains invalid characters.");
            return false;
        }
    }
    for (i = 0; i < domain.length; i++) {
        if (domain.charCodeAt(i) > 127) {
            if (emailctrl == "txtEmail") {
                document.getElementById("txtEmail").focus();
                document.getElementById("txtEmail").style.background = "pink";
            }
            
            alert("Ths domain name contains invalid characters.");
            return false;
        }
    }

    // See if "user" is valid 

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

        // user is not valid
        if (emailctrl == "txtEmail") {
            document.getElementById("txtEmail").focus();
            document.getElementById("txtEmail").style.background = "pink";
        }
        
        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) {
                if (emailctrl == "txtEmail") {
                    document.getElementById("txtEmail").focus();
                    document.getElementById("txtEmail").style.background = "pink";
                }
                
                alert("Destination IP address is invalid!");
                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) {
            if (emailctrl == "txtEmail") {
                document.getElementById("txtEmail").focus();
                document.getElementById("txtEmail").style.background = "pink";
            }
            
            alert("Your Email address does not seem to be valid.");
            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) {
        if (emailctrl == "txtEmail") {
            document.getElementById("txtEmail").focus();
            document.getElementById("txtEmail").style.background = "pink";
        }
        
        alert("The address 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) {
        if (emailctrl == "txtEmail") {
            document.getElementById("txtEmail").focus();
            document.getElementById("txtEmail").style.background = "pink";
        }
        
        alert("This address is missing a hostname!");
        return false;
    }

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


currentIndx = 0;
MyImages = new Array();

MyImages[0] = 'url(images/SlideImage1.jpg)';

MyImages[1] = 'url(images/SlideImage2.jpg)';

MyImages[2] = 'url(images/SlideImage3.jpg)';

MyImages[3] = 'url(images/SlideImage4.jpg)';

imagesPreloaded = new Array(4)

function RotateImages() {
    

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

        imagesPreloaded[i] = new Image(367, 243)

        imagesPreloaded[i].src = MyImages[i]

    }
}

function Nexter() {
    if (currentIndx < imagesPreloaded.length - 1) {
        currentIndx = currentIndx + 1;
        document.getElementById("ImageRotator").style.backgroundImage = MyImages[currentIndx];
        
    }
    else {
        currentIndx = 0
        document.getElementById("ImageRotator").style.backgroundImage = MyImages[currentIndx];

    }
    return false;    
}
function Backer() {
    if (currentIndx > 0) {
        currentIndx = currentIndx - 1;
        document.getElementById("ImageRotator").style.backgroundImage = MyImages[currentIndx];
        
    }
    else {
        currentIndx = 3
        document.getElementById("ImageRotator").style.backgroundImage = MyImages[currentIndx];        
    }
    return false;
}