var isNS = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4);
var HIDDEN = (isNS) ? 'hide' : 'hidden';
var VISIBLE = (isNS) ? 'show' : 'visible';

function show(object){
	object.visibility=VISIBLE;
}
function hide(object){
	object.visibility=HIDDEN;
}

function toggle(targetId){
 	target = (isNS) ? document(targetId) : document.all(targetId).style ;
  		if (target.display == "none")
  		{
 			target.display = "";
  		}
  		else
  		{
  			target.display = "none";
  		}
}