/***********************************************************************
*
* CreateArray	creates an array with n elements
*
* Input: n	-	number of elements
*
* Returns:		the created array
*
************************************************************************/

function CreateArray(n)
	{
	this.length = n;
	for (var i=1; i <= n; i++)							// for all ns
		{
		this[i] = new Section();						// create a section structure
		}
	return this;											// return the created array
	}

/***********************************************************************
*
* Section	-	creates the section structure for raw section lists
*
************************************************************************/

function Section()
	{
	this.sURL = null;
	this.sName = null;
	this.sImage = null;
	this.nImageWidth = null;
	this.nImageHeight= null;
	this.nSectionId	= null;
	this.pChild = null;
	}
	
/***********************************************************************
*
* SwapImage			-	swaps an image to the alternative
*
* Input:	sName		-	name of the image
*
*			sAltImage-	filename of the alternative image
*
************************************************************************/

function SwapImage(sName, sAltImage)
	{
	var nCount = 0;
	document.aSource = new Array;						// array for images
	if (document[sName] != null)						// if image name exists
		{
		document.aSource[nCount++] = document[sName];	// store image
		if(null == document[sName].sOldSrc)
			{
			document[sName].sOldSrc = document[sName].src;// store image source
			}
		document[sName].src = sAltImage;				// change image source to alternative
		}
	}

/***********************************************************************
*
* RestoreImage		-	restores an image to the original
*
************************************************************************/

function RestoreImage()
	{
	var nCount, aSource = document.aSource;
	if (aSource != null)									// if array of images exists
		{
		for(nCount=0; nCount < aSource.length; nCount++)	// restore all images
			{
			if ((aSource[nCount] != null) &&
				(aSource[nCount].sOldSrc != null))	// if we stored something for this image
				{
				aSource[nCount].src = aSource[nCount].sOldSrc;	// restore the original image
				}
			}
		}
	}

/***********************************************************************
*
* PreloadImages		-	restores an image to the original
*
************************************************************************/

function PreloadImages()
	{
	if(document.images)
		{
		if(!document.Preloaded)							// preload array defined?
			{
			document.Preloaded = new Array();		// no, define it
			}
		var nCounter , nLen = document.Preloaded.length, saArguments = PreloadImages.arguments;
		for(nCounter = 0; nCounter < saArguments.length; nCounter++)	// iterate through arguments
			{
			document.Preloaded[nLen] = new Image;
			document.Preloaded[nLen++].src = saArguments[nCounter];
			}
   	}
	}