function SwitchImg()
{ //start
  var rem, keep=0, store, obj, switcher=new Array, history=document.Data;
    for (rem=0; rem < (SwitchImg.arguments.length-2); rem+=3) 
	{
    	store = SwitchImg.arguments[(navigator.appName == 'Netscape')?rem:rem+1];
		
    if ((store.indexOf('document.layers[')==0 && document.layers==null) ||
        (store.indexOf('document.all[')==0 && document.all==null))
         store = 'document'+store.substring(store.lastIndexOf('.'),store.length);
         obj = eval(store);
		 
      if (obj != null)  
	    {
   	     switcher[keep++] = obj;
         switcher[keep++] = (history==null || history[keep-1]!=obj)?obj.src:history[keep];
         obj.src = SwitchImg.arguments[rem+2];
        } 
    }
  document.Data = switcher;
} //end

function RestoreImg()
{ //start
  if (document.Data != null)
    for (var rem=0; rem<(document.Data.length-1); rem+=2)
      document.Data[rem].src=document.Data[rem+1];
} //end


<!--preload images-->
var myimages=new Array()
function preloadimages(){
  for (i=0;i<preloadimages.arguments.length;i++){
    myimages[i]=new Image()
    myimages[i].src=preloadimages.arguments[i]
  }
}

preloadimages("Buttons/ButtonBase_Home_Over.jpg","Buttons/ButtonBase_Rooms_Over.jpg","Buttons/ButtonBase_Breakfast_Over.jpg","Buttons/ButtonBase_Location_Over.jpg","Buttons/ButtonBase_GuestComments_Over.jpg","Buttons/ButtonBase_Reservations_Over.jpg","Buttons/ButtonBase_AboutUs_Over.jpg","Buttons/ButtonBase_AboutDunedin_Over.jpg","Buttons/ButtonBase_TheGarden_Over.jpg","Buttons/ButtonBase_TheArt_Over.jpg","Buttons/ButtonBase_NZ_Links_Over.jpg");