// guidogeelen.com
var DHTML = (document.getElementById || document.all || document.layers);
function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
		this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
		this.obj = document.all[name];
		this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  }
}

function collapse(iNumber) {
	if (!DHTML) return;
	blok = new getObj('sub_' + iNumber);
	if (blok.style.display == 'block'){
		blok.style.display = 'none';		
	} else {
		blok.style.display = 'block';			
	}	
}

function selectYear(){
		if (document.year.jaar.options[document.year.jaar.selectedIndex].value != "none"){
				 url = document.year.jaar.options[document.year.jaar.selectedIndex].value
					location =url
		 }       
}