function ChangeNow(welke,aantal,zien){
	if(document.getElementById){
		for(var i=1;i<=aantal;i++){
			document.getElementById('sub'+i).style.visibility = 'hidden';
			document.getElementById('sub'+i).style.display = 'none';
		}
		if(zien == '1'){
			document.getElementById('sub'+welke).style.visibility = 'visible';
			document.getElementById('sub'+welke).style.display = 'block';
		}
	}
}
function hideAll(aantal){
	if(document.getElementById){
		for(var i=1;i<=aantal;i++){
			document.getElementById('sub'+i).style.visibility = 'hidden';
			document.getElementById('sub'+i).style.display = 'none';
		}
	}
}function ChangeTab(welke,zien){
	if(document.getElementById){
		for(var i=1;i<=2;i++){
			document.getElementById('tab'+i).style.visibility = 'hidden';
			document.getElementById('tab'+i).style.display = 'none';
			document.getElementById('tabLink'+i).setAttribute('class','btnTop');
			document.getElementById('tabLink'+i).setAttribute('className','btnTop');
		}
		if(zien == '1'){
			document.getElementById('tab'+welke).style.visibility = 'visible';
			document.getElementById('tab'+welke).style.display = 'block';
			document.getElementById('tabLink'+welke).setAttribute('class','btnTopAct');
			document.getElementById('tabLink'+welke).setAttribute('className','btnTopAct');
		}
	}
}