var DHTML = (document.getElementById || document.all || document.layers);

function wissel(vol,nieuw){
	vol = new getObj(vol)
	nieuw = new getObj(nieuw)
	vol.style.display = 'block'
	nieuw.style.display = 'none'
}

function toonverberg(item){
	item = new getObj(item)
	if(item.style.display == 'block'){
		item.style.display = 'none'
    } else {
		item.style.display = 'block'
	}
}


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];
  }
}