function openWindow(url, w, h, name)
{
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	var settings  ='height='+h+',';
	settings +='width='+w+',';
	settings +='top='+wint+',';
	settings +='left='+winl+',';
	settings +='scrollbars=no,';
	settings +='resizable=no,';
	settings +='menubar=no,';
	settings +='location=no,';
	settings +='status=no';
	popupWin = window.open(url, name, settings);
}

var knopaan = ""
var laaguit = "-1"

function knop_aan(id)
{
if (laaguit != id)
	{ 
	document["knop"+id].src = "images/view_close.jpg";
	}
}

function knop_uit(id)
{
if (laaguit != id)
	{ 
	document["knop"+id].src = "images/view.jpg";
	}
}

function laag_uit(id)
{
if (id != "-1" && id != laaguit)
	{
	document.getElementById('laag'+id).style.display = "block";
	document["knop"+id].src = "images/view_close.jpg";
	if (laaguit != "-1")
		{
		document.getElementById('laag'+laaguit).style.display = "none";
		document["knop"+laaguit].src = "images/view.jpg";
		}
	laaguit = id;
	}
	else
	{
	document.getElementById('laag'+id).style.display = "none";
	document["knop"+id].src = "images/view.jpg";	
	if (laaguit == "-1")
		{
		document.getElementById('laag'+laaguit).style.display = "block";
		document["knop"+laaguit].src = "images/view_close.jpg";
		}
	laaguit = "-1";
	}
}


var laagIn = ""

function changein(id)
{
if (laagIn!=id)
	{
	document.getElementById('sublaag'+id).style.display = "";
	}
}

function changeout(id)
{
if (laagIn!=id)
	{
	document.getElementById('sublaag'+id).style.display = "none";
	}
}