function cycleAds( adNumber, adInstance ) 
{
	var thisNumAds = eval( 'num' + adInstance + 'Ads' );
	var thisAdArray = eval( 'ad' + adInstance + 'Array' );
	var thisLastAd = eval( 'last' + adInstance + 'Ad' );
	var thisAdCycleDelay = 1000;
	if ( adInstance > 1 )
	{
		thisAdCycleDelay = '1'  + adInstance +  '00';
	}
				
	if( adNumber == thisNumAds )
	{
		adNumber = 0;
	}

	//set all ads to invisible
	for( var i=0; i<thisNumAds; i++ )
	{
		document.getElementById( thisAdArray[i] ).style.zIndex = 0;
	}
	var theAd = document.getElementById( thisAdArray[adNumber] );
	
	
	//set the ad to visible and put it on the top
	theAd.style.display = 'inline';
	
	//if there is an add up already
	if( thisLastAd != '' ) 
	{
		//fade the ad off
		fadeAdOff( thisLastAd, 100, adInstance )
	}
	
	//fade the ad on in a period of time
	fadeAdOn( theAd.id, 0, adInstance )
	
	thisLastAd = theAd.id;
}

function fadeAdOff( adID, opac, adInstance ) 
{	
	var theAd = document.getElementById( adID );
	theAd.style.display = 'none';
}

function fadeAdOn( adID, opac, adInstance ) 
{
	var thisNumAds = eval( 'num' + adInstance + 'Ads' )
	var thisAdArray = eval( 'ad' + adInstance + 'Array' );	
	var thisAdCycleDelay = 9000;
	if ( adInstance > 1 )
	{
		thisAdCycleDelay = '9'  + adInstance +  '00';
	}
	
	var theAd = document.getElementById( adID );
	theAd.style.display="inline";
	var adNumber;
	//if it has reached full opacity, hide all the other ads
	for( i=0; i<thisNumAds; i++ ) 
	{
		if( document.getElementById( thisAdArray[i] ).id != theAd.id ) 
		{
			document.getElementById( thisAdArray[i] ).style.display = 'none';
		}
		else 
		{
			adNumber = i;
		}
	}
	
	//set interval before next ad
	setTimeout( 'cycleAds( ' + ( adNumber + 1 ) + ', \'' + adInstance + '\' )', thisAdCycleDelay );
	
}


var adFunctionList = new Array();

// Attach a function to be called in the page onload event
function attachOnLoadEvent ( adFunction )
{
	var index = 0;
	
	if ( adFunctionList.length )
	{
		index = adFunctionList.length;
	}
	
	adFunctionList [ index ] = adFunction;
}

// loop over the functions calling them in order.
function callFunctionsInOrder ()
{
	if ( adFunctionList )
	{
		if ( adFunctionList.length )
		{
			for ( var i = 0; i < adFunctionList.length; i++ )
			{
				adFunctionList [ i ] ( );
			}
		}
	}
}

// add the call for function to the document onload event.
if ( window.addEventListener )
{
	window.addEventListener ( 'load', callFunctionsInOrder, true );
}
else if ( window.attachEvent )
{
	window.attachEvent ( 'onload', callFunctionsInOrder );
}
else
{
	window.onload = callFunctionsInOrder;
}


// Load the javascript file dynamically. This can be done after Page onLoad
function loadDynamicScript ( url )
{
	var script = document.createElement ( "script" );
	script.type="text/javascript";
	script.src = url;
	
	//append flash script as well
	
	var flashScript = document.createElement ( "script" );
	flashScript.type="text/javascript";
	flashScript.src = "http://adport.ibc.com.au/ad/flash/swfobject.js";
	
	document.getElementsByTagName ( "head" ) [ 0 ].appendChild ( flashScript );	
	document.getElementsByTagName ( "head" ) [ 0 ].appendChild ( script );

	
}



function loadAdScript1 ( )
{
	loadDynamicScript("http://adport.ibc.com.au/ad/adAfterLoad.asp?u=buildingwa&system=buildingwa&adInstance=1&adType=49&backupAdTypeList=50&show_javascript=1&pageid=1&homeid=0&div=adSpace&wmode=transparent")	
}

attachOnLoadEvent ( loadAdScript1 );