IE=(navigator.appName.charAt(0)=='M') ? true : false
//present = false;



	for (var i=1; i<=4; i++){
		var obj = eval ("pic"+i+"on=new Image");
		obj.src = "/content/img/n_"+i+".gif";
		obj = eval ("pic"+i+"off=new Image");
		obj.src = "/content/img/n_"+i+"-.gif";
	}

	function On (num){
		eval ("document.images['n"+num+"'].src = pic"+num+"on.src");	
	}

	function Off (num){
		eval ("document.images['n"+num+"'].src = pic"+num+"off.src");	
	}



	function LayerSwitch (Lname, obj){
        if(IE)
        // for old IE versions that do not support DOM: 
        obj=document.all[Lname];
        else
        // for new IE versions and everybody else:
        obj=document.getElementById(Lname);
        if(obj.style.display == 'none')
        obj.style.display='';
        else
        obj.style.display='none';
        }