function ChangeSub(submenu,state) {

  var isNet6;
  var isIE;
  if (navigator.appName == "Netscape") {
   if (navigator.appVersion.charAt(0) == "5") isNet6 = true;
  }
  if (navigator.appName.indexOf("Microsoft") != -1) isIE = true;

  var VisTest;
  var div1Object;
  
  if (isNet6) {
	VisTest = "none";
  	if (submenu== "heliskiing"){
		div1Object = document.getElementById("sub_heliskiing").style;		
		}
  	if (submenu== "your_trip"){
		div1Object = document.getElementById("sub_your_trip").style;		
		}
  	if (submenu== "airpowder"){
		div1Object = document.getElementById("sub_airpowder").style;		
		}
  	if (submenu== "contact_us"){
		div1Object = document.getElementById("sub_contact_us").style;		
		}
   }
   
  if (isIE) {
	VisTest = "none";
	if (submenu== "heliskiing"){
		div1Object = document.all.sub_heliskiing.style;
		}
	if (submenu== "your_trip"){
		div1Object = document.all.sub_your_trip.style;
		}
	if (submenu== "airpowder"){
		div1Object = document.all.sub_airpowder.style;
		}
	if (submenu== "contact_us"){
		div1Object = document.all.sub_contact_us.style;
		}
	}
  
    div1Object.display = state;
}