bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer>= 3) ||
(bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3";
else br = "n2";

if (br == "n3"){
img1off = new Image();
img1off.src = "images/nav/homeoff.gif";
img2off = new Image();
img2off.src = "images/nav/aboutusoff.gif";
img3off = new Image();
img3off.src = "images/nav/linksoff.gif";
img4off = new Image();
img4off.src = "images/nav/contactusoff.gif";
img5off = new Image();
img5off.src = "images/nav/newsletteroff.gif";
img6off = new Image();
img6off.src = "images/nav/backoff.gif";

img1on = new Image();
img1on.src = "images/nav/homeon.gif";
img2on = new Image();
img2on.src = "images/nav/aboutuson.gif";
img3on = new Image();
img3on.src = "images/nav/linkson.gif";
img4on = new Image();
img4on.src = "images/nav/contactuson.gif";
img5on = new Image();
img5on.src = "images/nav/newsletteron.gif";
img6on = new Image();
img6on.src = "images/nav/backon.gif";

}

function imgAct(imgName){
if (br == "n3"){
document[imgName].src = eval(imgName + "on.src");
}

}
function imgInact(imgName){
if (br == "n3"){
document[imgName].src = eval(imgName + "off.src");
}

}
function emailCheck (tempobj) {

	emailStr = tempobj.value
	/* 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("The Email address entered is not in a valid format");
		tempobj.focus();
		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("Ths username contains invalid characters.");
			tempobj.focus();
			return false;
   		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			tempobj.focus();
			return false;
   		}
	}

	// See if "user" is valid 

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

		// user is not valid

		alert("The username doesn't seem to be valid.");
		tempobj.focus();
		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!");
				tempobj.focus();
				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.");
			tempobj.focus();
			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 email address must end in a well-known domain or two letter " + "country.");
		tempobj.focus();
		return false;
	}

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

	if (len<2) {
		alert("This address is missing a hostname!");
		tempobj.focus();
		return false;
	}

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



function checkcontactrequired(which) {
	var pass=true;
	if (document.images) {
		for (i=0;i<which.length;i++) {
			var tempobj=which.elements[i];
			
			if (tempobj.name=="OrgName"||tempobj.name=="ContactName"||tempobj.name=="Phone") {
				if (tempobj.value=='') {
						pass=false;
						break;
         			}
         		}

			else if (tempobj.name=="EmailAddr") {
				var ret=emailCheck (tempobj);
				if(ret==false) {
					return false;
				}
			}
			
   		}
	}
	
	if (!pass) {
		if(tempobj.name=="OrgName") {
			shortFieldName = "Please enter the name of your organisation"
		}
		else if(tempobj.name=="ContactName") {
			shortFieldName = "Please enter the name of your HR contact"
		}
		else if(tempobj.name=="Phone") {
			shortFieldName = "Please enter your phone number"
		}
		else if(tempobj.name=="EmailAddr") {
			shortFieldName = "Please enter your Email address"
		}
		alert(shortFieldName);
		tempobj.focus();
		return false;
	}
	else
		return true;
}


function checksubscriberequired(which) {
	var pass=true;
	if (document.images) {
		for (i=0;i<which.length;i++) {
			var tempobj=which.elements[i];
			
			if (tempobj.name=="EmailAddr") {
				var ret=emailCheck (tempobj);
				if(ret==false) {
					return false;
				}
			}

			else if (tempobj.name=="SubscribeOption") {
				if (WhichListElementIsSelected(tempobj.name) == "-- Select Subscription Option --") {
					pass=false;
					break;
				}
			}
			
   		}
	}
	
	if (!pass) {
		if(tempobj.name=="EmailAddr") {
			shortFieldName = "Please enter your Email address"
		}
		else if(tempobj.name=="SubscribeOption") {
			shortFieldName = "Please specify if you wish to subscribe or unsubscribe"
		}

		alert(shortFieldName);
		tempobj.focus();
		return false;
	}
	else
		return true;
}

function WhichListElementIsSelected(sFieldName) {
	oForm = document.forms[0];
	oElement = oForm.elements(sFieldName);
	sRequest = oElement[oElement.selectedIndex].text;

	return(sRequest);
}