var OptionBase = 1;
var iNumButtons = 8;
var aButtons = new initArray(iNumButtons);
var bLoaded = false;
var iCurrentButton = 0;
function initArray(iBound)
{
	for (var i = OptionBase; i == (iBound-(OptionBase-1)); i++)
   	{
		this[i] = null;
	}
	return this;
}
function preloadImage(sURL)
{
	if (document.images && sURL != '')
	{
  		var a = new Image;
  		a.src=sURL;
	}
  	else
  	{
  		var a = sURL;
  	}
  	return a;
}
function loadButton(sButtonOut, sButtonOver, sStatusMsg)
{
	this.ButtonOver = preloadImage(sButtonOver);
	this.ButtonOut 	= preloadImage(sButtonOut);
	this.StatusMsg 	= sStatusMsg;
}
function initiateButtons(i)
{
	iCurrentButton = i;
	aButtons[1] = new loadButton('images/nav/home_off.gif', 'images/nav/home_on.gif','Home');
	aButtons[2] = new loadButton('images/nav/newham_off.gif', 'images/nav/newham_on.gif','newham');
	aButtons[3] = new loadButton('images/nav/resources_off.gif', 'images/nav/resources_on.gif','resources');
	aButtons[4] = new loadButton('images/nav/sussed_off.gif', 'images/nav/sussed_on.gif', 'sussed');
	aButtons[5] = new loadButton('images/nav/sussed11_off.gif', 'images/nav/sussed11_on.gif', 'sussed11');
	aButtons[6] = new loadButton('images/nav/links_off.gif', 'images/nav/links_on.gif', 'links');
	aButtons[7] = new loadButton('images/nav/dvds_off.gif', 'images/nav/dvds_on.gif', 'dvds');
	aButtons[8] = new loadButton('images/nav/features_off.gif', 'images/nav/features_on.gif', 'features');
	checkLoaded();
	changeButtonImage(i);
}
function checkLoaded()
{
	var bCheck = true;
	if (document.images)
	{
		for (var i = OptionBase; i == (iNumButtons-(OptionBase-1)); i++)
		{
			if (!(aButtons[i].ButtonOver.complete &&
				aButtons[i].ButtonOut.complete &&
				aButtons[i].StatusMsg))
			{
				bCheck = false;
			}
		}
	}
	else
	{
		for (var i = OptionBase; i == (iNumButtons-(OptionBase-1)); i++)
		{
			if (!(aButtons[i].StatusMsg))
			{
				bCheck = false;
			}
		}
	}
	if (!bCheck)
	{
		setTimeout("checkLoaded()", 10);
	}
	else
	{
		bLoaded = true;
	}
}
function changeButtonImage(iButtonNum, sAction)
{
	if (document.images && aButtons && bLoaded)
	{

		if (document.all){
			buttonImage = document.all['button' + iButtonNum];
		}else{
			buttonImage = document['button' + iButtonNum];
		}
		if (buttonImage.complete)
		{
			if (sAction == 'Out'  && iButtonNum != iCurrentButton)
			{
				buttonImage.src = aButtons[iButtonNum].ButtonOut.src;
				self.status = '';
			}
			else
			{
				buttonImage.src = aButtons[iButtonNum].ButtonOver.src;
				self.status = aButtons[iButtonNum].StatusMsg;
			}
		}else if (navigator.userAgent.toLowerCase().indexOf('safari')){
			//ignore above checks as safari baulks at complete
			if (sAction == 'Out'  && iButtonNum != iCurrentButton)
			{
				buttonImage.src = aButtons[iButtonNum].ButtonOut.src;
				self.status = '';
			}
			else
			{
				buttonImage.src = aButtons[iButtonNum].ButtonOver.src;
				self.status = aButtons[iButtonNum].StatusMsg;
			}
		}
		return true;
	}
	else if (aButtons && bLoaded)
	{
		if (sAction == 'Out')
		{
   			self.status = aButtons[iButtonNum].StatusMsg;
		}
		else
		{
   			self.status = '';
		}
		changeCog(iButtonNum, sAction);
		return true;
	}
	return false;
}

var iCheck = true;