// Standard js

function GoMenu(selMenu)
{
	if(selMenu.options[selMenu.selectedIndex].value.length != 0)
		location = selMenu.options[selMenu.selectedIndex].value;
}

function setActiveStyleSheet(title) {
   var i, a;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")) {
       a.disabled = true;
       if(a.getAttribute("title") == title) a.disabled = false;
     }
   }
}

/*
	Supply a list of pictures to load in the format:
	<picture name>, <location of picture>
*/
function preloadImages()
{
	if(document.images)
	{
		var i, a = preloadImages.arguments;
		
		if(!document.rolloverPicNames)
			document.rolloverPicNames = new Array();
		if(!document.rolloverPics)
			document.rolloverPics = new Array();
	
		for(i = 0; i < a.length; i += 2)
		{
			document.rolloverPicNames[i] = a[i];
			document.rolloverPics[i] = new Image;
			document.rolloverPics[i].src = a[i + 1];
		}
	}
}

/*
	change the image displayed in the given picture object
	to the one with the supplied name
*/
function swapImage(imageToSwap, newImageName)
{
	// find the index of the picture whose name is newImageName
	var i, picIndex = -1;
	for(i = 0; i < document.rolloverPics.length; i++)
		if(document.rolloverPicNames[i] == newImageName)
			picIndex = i;
	
	// swap the src of imageToSwap to become the relevant
	// image in document.rolloverPics[]
	if(picIndex >= 0)
	{
		// store the image's original src if we haven't already
		if(!imageToSwap.oSrc)
			imageToSwap.oSrc = imageToSwap.src;
			
		imageToSwap.src = document.rolloverPics[picIndex].src;
	}
}

/*
	Revert image(s) to original state
*/
function revertImage()
{
	var i, theImage, a = revertImage.arguments;
	for(i = 0; a && (i < a.length) && (theImage = a[i]) && theImage.oSrc; i++)
		theImage.src = theImage.oSrc;
}

/* 
	This section of code is used in the galerry masterpage in about/art/gallery 
	This script identifies the next page, previous page and parent page of this page
*/

var thisNo = -1, nextNo = -1, prevNo = -1;

function GetNextAndPrevious()
{
		<!--preloadImages('close normal', '../../Cass/button_popup_close.gif', 'close hover', '../../Cass/button_popup_close_hover.gif', 'print normal', '../../Cass/button_popup_print.gif', 'print hover', '../../Cass/button_popup_print_hover.gif');-->
		
		// get name of current page
		var currentPageName = document.siblings.elements[0].name;
		
		// find where we are in the list of siblings
 		for(var i = 2; i < document.siblings.elements.length; i++)
			if(currentPageName == document.siblings.elements[i].name)
			{
				thisNo = i;
				prevNo = i - 1;
				nextNo = i + 1;
				
				// check to see if next and previous are out of bounds
				if(prevNo < 2)
					prevNo = -1;
				
				if(nextNo >= document.siblings.elements.length)
					nextNo = -1;
			}
}

function GoToNextPage()
{
	location = document.siblings.elements[nextNo].value;
}

function GoToPreviousPage()
{
	location = document.siblings.elements[prevNo].value;
}

function GoToParentPage()
{
	location = document.siblings.elements[1].value;
}












/*

	Code to provide pop-up menus for the home page

*/



// define getElementByID() in browsers that don't have it already

if(!document.getElementById)

{

	if(document.all)

	{

		document.getElementById = function(id) { return document.all[id]; }

	}

	else if(document.layers)

	{

		document.getElementById = function(id) { return document.layers[id]; }

	}

	else

	{

		document.getElementById = function(id) { return null; }

	}

}



// ========================================================================	



// global variables

var PICurrentSubnavMenu = null; // currently showing menu

var PIMenuToHide = null; // menu we've scheduled to hide

var PIMenuHideTime = 333; // number of milliseconds menus take to disappear

var PIMenuHideTimeout = null;



// called when the mouse moves into a main nav button

function PIMouseOverNav(menuName)

{

	if(menuName != null)

	{

		// hide the currently visible subnav if there is one

		PIHideMenu();

				

		// show the new menu

		PIToggleSubnav(menuName);

		PICurrentSubnavMenu = menuName;

	}

	

	// set the button's arrow to be highlighted

	//var arrowImage = document.getElementById(menuName + "arrow");

	//swapImage(arrowImage, 'navon');

	//PISwapImage(menuName, true);

}



// called when the mouse moves out of the main nav button

function PIMouseOutNav(menuName)

{

	if(menuName != null)

	{

		// schedule the subnav menu to be hidden

		PIHideMenuWithDelay();

	}

	

	// set the button's arrow to be normal

	//var arrowImage = document.getElementById(menuName + "arrow");

	//revertImage(arrowImage);

	//PISwapImage(menuName, false);	

}



// deal with the mouse pointer moving into a subnav menu

function PIMouseOverSubnav(menuName)

{

	// if this menu was scheduled to be hidden then cancel that

	if(PIMenuToHide == menuName)

	{

		PIHideMenuCancel();			

	}

}



// called when the mouse moves out of a subnav menu

function PIMouseOutSubnav(menuName)

{

	// schedule this menu to be hidden

	PIHideMenuWithDelay();

}



// ========================================================================



// swap the image contained in the given paragraph tag

// para needs to be <p><a ...><img ...> ... so img is first child

// of first child of paragraph

// if isSubnav = true then subnav arrow image is used

function PISwapImage(paraElem, isSubnav)

{

	if(paraElem == null) { return; }

	var anchorElem = paraElem.firstChild;

	if(anchorElem == null) { return; }

	// check if the anchor is actually an image

	image = null;

	if(anchorElem.nodeName == "IMG")

		image = anchorElem;

	else

		image = anchorElem.firstChild;



	// if we have the image then swap it

	if(image != null)

	{

		if(isSubnav)

		{

			swapImage(image, 'subnavon');

		}

		else

		{

			swapImage(image, 'navon');

		}

	}

}



// same as PISwapImage but reverts the image back to its original form

function PIRevertImage(paraElem)

{

	if(paraElem == null) { return; }

	var anchorElem = paraElem.firstChild;

	if(anchorElem == null) { return; }

	// check if the anchor is actually an image

	image = null;

	if(anchorElem.nodeName == "IMG")

		image = anchorElem;

	else

		image = anchorElem.firstChild;



	// if we have the image then revert it

	if(image != null)

	{

		revertImage(image);

	}

}



// ========================================================================	



// hide the currently visible subnav menu immediately

// used when closing one subnav and opening another straight away

function PIHideMenu()

{

	// if the menu we want to hide now is already on a timed hide then cancel the times hide

	if(PICurrentSubnavMenu == PIMenuToHide)

	{

		PIHideMenuCancel();		

	}

	

	if(PICurrentSubnavMenu != null)

	{

		PIToggleSubnav(PICurrentSubnavMenu);

		PICurrentSubnavMenu = null;

	}

}



// hide the currently visible subnav menu after a few seconds

// used when user has not gone into another subnav to replace the current one

function PIHideMenuWithDelay()

{

	// not sure what to do if we already have a timeout going

	

	PIMenuToHide = PICurrentSubnavMenu;

	PIMenuHideTimeout = setTimeout("PIToggleSubnav(PIMenuToHide)", PIMenuHideTime); 

}



// cancel a delayed hide of a subnav menu

function PIHideMenuCancel()

{

	if(PIMenuHideTimeout != null)

	{

		PIMenuToHide = null;

		clearTimeout(PIMenuHideTimeout);

	}

}



// make a menu visible if it's invisible and vice-versa

function PIToggleSubnav(menuName)

{		

	if(menuName == null)

	{

		return;

	}

	

	var menuObj = document.getElementById(menuName);

	if(menuObj == null)

	{

		return;

	}

	

	if(menuObj.style.visibility == 'visible')

	{

		menuObj.style.visibility = 'hidden';

		

		// if this was the currently visible menu then set the currently visible menu to null

		if(menuName == PICurrentSubnavMenu)

		{

			PICurrentSubnavMenu = null;

		}

	}

	else

	{

		menuObj.style.visibility = 'visible';

		menuObj.style.zIndex = 100;

	}

}



// ========================================================================	



/*

	Supply a list of pictures to load in the format:

	<picture name>, <location of picture>

*/

function preloadImages()

{

	if(document.images)

	{

		var i, a = preloadImages.arguments;

		

		if(!document.rolloverPicNames)

			document.rolloverPicNames = new Array();

		if(!document.rolloverPics)

			document.rolloverPics = new Array();

	

		for(i = 0; i < a.length; i += 2)

		{

			document.rolloverPicNames[i] = a[i];

			document.rolloverPics[i] = new Image;

			document.rolloverPics[i].src = a[i + 1];

		}

	}

}



/*

	change the image displayed in the given picture object

	to the one with the supplied name

*/

function swapImage(imageToSwap, newImageName)

{

	// find the index of the picture whose name is newImageName

	var i, picIndex = -1;

	if(document.rolloverPics == null) { return; }

	for(i = 0; i < document.rolloverPics.length; i++)

		if(document.rolloverPicNames[i] == newImageName)

			picIndex = i;

	

	// swap the src of imageToSwap to become the relevant

	// image in document.rolloverPics[]

	if(picIndex >= 0)

	{

		// store the image's original src if we haven't already

		if(!imageToSwap.oSrc)

			imageToSwap.oSrc = imageToSwap.src;

			

		imageToSwap.src = document.rolloverPics[picIndex].src;

	}

}



/*

	Revert image(s) to original state

*/

function revertImage()

{

	var i, theImage, a = revertImage.arguments;

	for(i = 0; a&& (i < a.length)&& (theImage = a[i])&& theImage.oSrc; i++)

		theImage.src = theImage.oSrc;

}

function CallPrint(strid)  {  
	var prtContent = document.getElementById(strid);  
	var WinPrint = window.open();   
	WinPrint.document.write(prtContent.innerHTML); 
	WinPrint.document.close();  
	WinPrint.focus();  
	WinPrint.print(); 
	WinPrint.close(); 
	prtContent.innerHTML=strid;  
}