function show(object) {
  if (document.getElementById) {
    document.getElementById(object).style.visibility = 'visible';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].visibility = 'visible';
  }
  else if (document.all) {
    document.all[object].style.visibility = 'visible';
  }
}

function hide(object) {
  if (document.getElementById) {
    document.getElementById(object).style.visibility = 'hidden';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].visibility = 'hidden';
  }
  else if (document.all) {
    document.all[object].style.visibility = 'hidden';
  }
}

function venster(mypage,w,h) 
{
	window.showModalDialog(mypage,window,"dialogHeight: "+h+"px; dialogWidth: "+w+"px; dialogTop: px; dialogLeft: px; edge: Sunken; center: Yes; help: No; resizable: No; status: No; scroll : No; unadorned: yes;");
}

function proef() {
mydel = 1;
vensterscroll('funda_popup.html','463','229')
}

function proef_2() {
mydel = 1;
vensterscroll('verz_popup.html','500','400')
}

function vensterscroll(mypage,w,h) 
{
	window.open(mypage, 'popupje', 'toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=0,width='+w+',height='+h+',top='+((screen.height-h)/2)+',left='+((screen.width-w)/2)+',scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no');
}