window.onload = jsFnOnload;

function jsFnOnload()
{
	if (document.getElementById)
	{		
		var menu = document.getElementById("topmenu");
 		if (menu != null) 
		{
			var lis = menu.getElementsByTagName("li");
			for(aliindex=0;aliindex<lis.length;aliindex++)
			{
				if(lis[aliindex].className=='level1')
				{
					lis[aliindex].onclick = JSFnMenuLiClick;
					
					lis[aliindex].onmouseover = JSFnMenuLiOver;
					lis[aliindex].onmouseout = JSFnMenuLiOut;
				}
			}
		}		
		
		var aContactForm = document.getElementById('contactform');
		if (aContactForm != null) aContactForm.onsubmit = JSFnValidateContactForm;
		
		var aImageZoom = document.getElementById('largeimage');
		if (aImageZoom != null) aImageZoom.onclick = JSFnImageZoom;
	}
	
	JSFnAddLightboxMarkup();
}

function JSFnMenuLiOver()
{
	this.className = 'level1 hover';
}

function JSFnMenuLiOut()
{
	this.className = 'level1';
}

function JSFnMenuLiClick()
{
	window.location = this.childNodes[0].href;
	//alert(this.childNodes[0]);
}

function JSFnGoBack()
{
	history.go(-1);
}

function JSFnImageZoom()
{
	var aWindow = window.open(this.href, 'productbig', 'menubar=no, resizeable=no, toolbar=no, width=600px, height=600px')
	aWindow.focus();
	return false;
}

var aContactRequiredFields = new Array ("Terms","Please tick to confirm that you would like to be added to the mailing list",
										"FirstName","Please enter your first name to continue",
										"Surname","Please enter your surname to continue");

function JSFnValidateContactForm()
{
	var aEmail = document.getElementById('EmailAddress');
	var aAddress = document.getElementById('Address');

	if ((aEmail != null) && (aAddress != null))
	{
		if ((aEmail.value == '') && (aAddress.value == ''))
		{
			alert('You must provide either your postal address or email address to continue.');
			return false;
		}
	}

	return JSFnValidateForm(aContactRequiredFields);
}

function JSFnValidateForm(aRequiredFields)
{
	for (aIndex = 0; aIndex < aRequiredFields.length; aIndex = aIndex + 2)
	{
		currElement = document.getElementById(aRequiredFields[aIndex]);
		if (currElement != null)
		{
			if  (   (   (currElement.type == 'text')
				     && (currElement.value == ''))
				 || (   (currElement.type == 'password')
				     && (currElement.value == ''))
				 || (   (currElement.type == 'checkbox')
				     && (currElement.checked == false))
				 || (   (currElement.type == 'file')
				     && (currElement.value == ''))
				 || (   (currElement.type == 'textarea')
				     && (currElement.value == ''))
				 || (   (currElement.type == 'select-one')
				     && (currElement.value == '')))
			{
				alert(aRequiredFields[aIndex + 1]);
				return false;
			}
			else if (currElement.type == 'radio')
			{
				aIndex = aIndex + 2;
				if (!currElement.checked)
				{
					currElement = document.getElementById(aRequiredFields[aIndex]);
					if ((currElement.type == 'radio') && (!currElement.checked))
					{
						alert(aRequiredFields[aIndex + 1]);
						return false;
					}
				}
			}
		}
	}
	return true;
}

function JSFnShowHeaderImage(imageName)
{
	var aHeaderImage = document.getElementById('templateholder');
	var aOverlay = document.getElementById('overlay');
	if ((aHeaderImage != null) && (aOverlay != null)) 
	{
		aHeaderImage.style.display = 'block';
		aOverlay.style.display = 'block';
		
		bod	= document.getElementsByTagName('body')[0];
		
		imagePopout = document.createElement('div');
		imagePopout.id = "ImagePopout";
				
		aImage = document.createElement('img');
		aImage.id = "popoutImage";
		aImage.src = "images/templateimages/" + imageName;
		
		aLeftNav = document.createElement('img');
		aLeftNav.src = "images/left_arrow.png";
		aLeftNav.id = "leftnav";
		aRightNav = document.createElement('img');
		aRightNav.src = "images/right_arrow.png";
		aRightNav.id = "rightnav";
		aCloseButton = document.createElement('img');
		aCloseButton.src = "images/close_button.png";
		aCloseButton.id = "closebtn";
		
		aOverlay.onclick = JSFnCloseHeaderImage;
		aLeftNav.onclick = JSFnPrevHeaderImage;
		aRightNav.onclick = JSFnNextHeaderImage;
		aCloseButton.onclick = JSFnCloseHeaderImage;
			
		imagePopout.appendChild(aImage);
		imagePopout.appendChild(aLeftNav);
		imagePopout.appendChild(aRightNav);
		imagePopout.appendChild(aCloseButton);
				
		bod.appendChild(imagePopout);
		bod.style.height = '100%';
  
		htm = document.getElementsByTagName('html')[0];
		htm.style.height = '100%';
		
		numberOfImages = getElementsByClassName("headerimage").length;
		
	}
}

function JSFnCloseHeaderImage()
{
	var aOverlay = document.getElementById('overlay');
	
	if (aOverlay != null) 
	{
		var imageHolder = document.getElementById('ImagePopout');
		
		aOverlay.style.display = 'none';

		var Node = imageHolder;
		Node.parentNode.removeChild(Node);
	}
}

function JSFnAddLightboxMarkup() 
{
	bod 				= document.getElementsByTagName('body')[0];
	overlay 			= document.createElement('div');
	overlay.id		= 'overlay';
	lb					= document.createElement('div');
	lb.id				= 'lightbox';
	lb.className 	= 'loading';
	// lb.innerHTML	= '<div id="lbLoadMessage">' +
	// 					  '<p>Loading</p>' +
	// 					  '</div>';
	
	
	bod.appendChild(overlay);
	bod.appendChild(lb);
}

/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};

function JSFnNextHeaderImage()
{
	var aHeaderImages = document.getElementById('templateholder');
	var aDisplayedImage = document.getElementById('popoutImage');
	if ((aHeaderImages != null) && (aDisplayedImage != null)) 
	{
		// Get the current image from the displayed one
		aCurrImageSrc = aDisplayedImage.src.substr(aDisplayedImage.src.lastIndexOf('/') + 1);
		
		// Run through the template until we find it
		var aImages = aHeaderImages.getElementsByTagName("img");
		for(aIndex = 0; aIndex < aImages.length; aIndex++)
		{
			if (aCurrImageSrc == aImages[aIndex].src.substr(aImages[aIndex].src.lastIndexOf('/') + 1)) aImageNumber = aIndex;
		}
		
		// Identify Next Image
		if (aImageNumber == aImages.length - 1) aImageNumber = 0;
		else aImageNumber++;
		
		// Switch image for next one
		aDisplayedImage.src = 'images/templateimages/' + aImages[aImageNumber].src.substr(aImages[aImageNumber].src.lastIndexOf('/') + 1); 
	}
}

function JSFnPrevHeaderImage()
{
	var aHeaderImages = document.getElementById('templateholder');
	var aDisplayedImage = document.getElementById('popoutImage');
	if ((aHeaderImages != null) && (aDisplayedImage != null)) 
	{
		// Get the current image from the displayed one
		aCurrImageSrc = aDisplayedImage.src.substr(aDisplayedImage.src.lastIndexOf('/') + 1);
		
		// Run through the template until we find it
		var aImages = aHeaderImages.getElementsByTagName("img");
		for(aIndex = 0; aIndex < aImages.length; aIndex++)
		{
			if (aCurrImageSrc == aImages[aIndex].src.substr(aImages[aIndex].src.lastIndexOf('/') + 1)) aImageNumber = aIndex;
		}
		
		// Identify Next Image
		if (aImageNumber == 0) aImageNumber = aImages.length - 1;
		else aImageNumber--;
		
		// Switch image for next one
		aDisplayedImage.src = 'images/templateimages/' + aImages[aImageNumber].src.substr(aImages[aImageNumber].src.lastIndexOf('/') + 1); 
	}
}