var isIE=document.all?true:false;
var isDOM=document.getElementById?true:false;
var isNS4=document.layers?true:false;

/* _w : which ID (1) or (2) */
/* _h : (h)ide or (s)how */
function toggleT(_w,_h) {
  if (isDOM)
  {
    if (_h=='s') document.getElementById(_w).style.visibility='visible';
    if (_h=='h') document.getElementById(_w).style.visibility='hidden';
  }
  else if (isIE) {
    if (_h=='s') eval("document.all."+_w+".style.visibility='visible';");
    if (_h=='h') eval("document.all."+_w+".style.visibility='hidden';");
  }
  else if(isNS4)
  {
    if (_h=='s') eval("document.layers['"+_w+"'].visibility='show';");
    if (_h=='h') eval("document.layers['"+_w+"'].visibility='hide';");
  }
}

var preloadFlag = false;
function preloadImages() {
 if (document.images) {
  map_wa = newImage("/images/wa_map2.gif");
  map_nt = newImage("/images/nt_map2.gif");
  map_nsw = newImage("/images/nsw_map2.gif");
  map_qld = newImage("/images/qld_map2.gif");
  map_vic = newImage("/images/vic_map2.gif");
  map_sa = newImage("/images/sa_map2.gif");
  preloadFlag = true;
 }
}