// preloadimages 

	homehomeon =  new Image();
	homehomeon.src = "images/homehomeon.gif";
	homehomeoff = new Image();
	homehomeoff.src = "images/homehomeoff.gif";

	homeabouton = new Image();
	homeabouton.src = "images/homeabouton.gif";						
	homeaboutoff = new Image();
	homeaboutoff.src = "images/homeaboutoff.gif";

	homecontacton = new Image();
	homecontacton.src = "images/homecontacton.gif";	
	homecontactoff = new Image();
	homecontactoff.src = "images/homecontactoff.gif";	

	opticalon = new Image();
	opticalon.src = "images/opticalon.gif";	
	opticaloff = new Image();
	opticaloff.src = "images/opticaloff.gif";	

	trainingon = new Image();
	trainingon.src = "images/trainingon.gif";	
	trainingoff = new Image();
	trainingoff.src = "images/trainingoff.gif";

	developmenton = new Image();
	developmenton.src = "images/developmenton.gif";	
	developmentoff = new Image();
	developmentoff.src = "images/developmentoff.gif";
	
	// function to do rollovers on images
	function swapImage(num){
		if (num=="1") document.images ['homehome'].src = homehomeon.src;
		else if (num=="2") document.images ['homehome'].src = homehomeoff.src;				
		else if (num=="3") document.images ['homeabout'].src = homeabouton.src;	
		else if (num=="4") document.images ['homeabout'].src = homeaboutoff.src;	
		else if (num=="5") document.images ['homecontact'].src = homecontacton.src;
		else if (num=="6") document.images ['homecontact'].src = homecontactoff.src;				
		else if (num=="7") document.images ['optical'].src = opticalon.src;	
		else if (num=="8") document.images ['optical'].src = opticaloff.src;		
		else if (num=="9") document.images ['training'].src = trainingon.src;
		else if (num=="10") document.images ['training'].src = trainingoff.src;
		else if (num=="11") document.images ['development'].src = developmenton.src;	
		else if (num=="12") document.images ['development'].src = developmentoff.src;
	}