var items = new Array();

function addSub(str) {
	items.push(str);
}

function openSub(num) {	
		//alert(items);
		closeSubs();
		document.getElementById("sub"+num).style.visibility = "visible";
		document.getElementById("knop"+num).style.border = "thin dotted black";
}

function closeSubs() {
		for (i=0;i<items.length;i++) {
			//if(num!=items[i]) {
				document.getElementById("sub"+items[i]).style.visibility = "hidden";
				document.getElementById("sub"+items[i]).style.height = "0px";
				//alert("sub"+itemsarray[i].toString());
				document.getElementById("knop"+items[i]).style.border = "thin dotted white";
			//}
		}
}

function jaartje(jaartal) {
	jaren('knop2009','knopuit2009');	
	jaren('knop2008','knopuit2008');	
	jaren('knop2010','knopuit2010');
	jaren('knop2011','knopuit2011');	
	var jaaruit = 'knopuit' + jaartal;
	var jaaraan = 'knop' + jaartal;
	//alert(jaar);
	jaren(jaaruit,jaaraan);
}

function jaren(oud,nieuw) { 

var obj = document.getElementsByClassName(oud) 
for(i=0;i<obj.length;i++) { 
obj[i].className= nieuw } 
} 

document.getElementsByClassName = function (c) { 

var r = new Array() 
var j = 0 
var o = document.getElementsByTagName("*") 
for(i=0;i<o.length;i++)
{ 
if(o[i].className == c) { 
r[j]=o[i];j++; 
} 
} 
return r; 
}