function setDisplayDefault() {
	//
	// Set defaults
	var allPageTags = new Array();
	var allPageTags = document.getElementsByTagName("div");
	var fullCount = allPageTags.length -1;	
	for (i=0;i<=fullCount;i++) {
		var currentLayer = allPageTags[i].id.indexOf("menuOpt");
		if (currentLayer != -1) {
			currentLayer = document.getElementById([allPageTags[i].id]);
			currentLayer.style.display = "none";
		}
	}
}

function showMenu (sID) {
	//
	// Kill other menus
	setDisplayDefault();
	//
	// Configure variables
	var sMenuLink = "menuOptLink" + sID;
	var sMenuLayer = "menuOpt" + sID;
	var sMenuLinkName = sMenuLink;
	var browserAgent = navigator.userAgent.toLowerCase();
	sMenuLink = document.getElementById([sMenuLink]);
	sMenuLink = sMenuLink.offsetLeft;
	//
	// Set-up menus
	if (sMenuLinkName == "menuOptLinkOne") {
		if (browserAgent.indexOf("msie 6") != -1) {
			scrnLeft = (parseInt(sMenuLink) + 90) + 'px';
		} else if (browserAgent.indexOf("msie 7") != -1) {
			scrnLeft = (parseInt(sMenuLink) + 80) + 'px';
		} else {
			scrnLeft = (parseInt(sMenuLink) - 46) + 'px';
		}
		
	} else {
		if (browserAgent.indexOf("msie 6") != -1) {
			scrnLeft = (parseInt(sMenuLink) + 106) + 'px';
		} else if (browserAgent.indexOf("msie 7") != -1) {
			scrnLeft = (parseInt(sMenuLink) + 96) + 'px';
		} else {
			scrnLeft = (parseInt(sMenuLink) - 29) + 'px';
		}
	}
	//
	// Format menu element
	document.getElementById([sMenuLayer]).style.display='block';
	document.getElementById([sMenuLayer]).style.left = scrnLeft;
}

function writeMenuItem (sText,sURL,sMenuItem) {
	document.writeln('<li id="menuOptLink' + sMenuItem + '" onmouseover="showMenu(\047' +  sMenuItem + '\047);" onmouseout="setDisplayDefault();"><a href="'+ sURL + '">' + sText + '<\/a><\/li>');
}


// Function to randomise image on home page.
function randomImage () {
	var nPicsTotal, nTotal;
	nPicsTotal = 6;	
	//
	// Collect previous value and convert
	nTotal = ReadCookie ("nHomePageImages");	
	if (nTotal > 0) {
		nTotal = parseFloat(nTotal);
	} else {
		nTotal = 0;
	}	
	//
	// Calculate display image
	if (nTotal==null || nTotal==0) {
		nTotal = 1;
	} else {
		nTotal = (nTotal + 1);
	}	
	if (nTotal > nPicsTotal) nTotal = 1;	
	//
	// Set cookie for return visit	
	SetCookie ("nHomePageImages",nTotal,5);
	//
	// Set background
	if (document.getElementById("randomImage")) {
		document.getElementById("randomImage").className="homeBackImage" + nTotal;
	}
}

// Standard Set Cookie Function
function SetCookie(cookieName,cookieValue,nDays) {
	var today = new Date();
	var expire = new Date();

	if (nDays==null || nDays==0) nDays=1;
	expire.setTime(today.getTime() + 3600000*24*nDays);
 	document.cookie = cookieName+"="+escape(cookieValue) + ";expires="+expire.toGMTString();
}

// Standard Read Cookie Function
function ReadCookie(cookieName) {
	var theCookie=""+document.cookie;
	var ind=theCookie.indexOf(cookieName);

 	if (ind==-1 || cookieName=="") return "";
 	var ind1=theCookie.indexOf(';',ind);

 	if (ind1==-1) ind1=theCookie.length;
 	return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}


// Attach events
if (window.attachEvent) {
 	window.attachEvent("onload", randomImage);
} else if (window.addEventListener){
 	window.addEventListener("load", randomImage, false);
} else if (document.addEventListener){
 	document.addEventListener('load', randomImage, false);
}