function launchWindow(url, name, w, h)  
{
  var winX = (screen.availWidth - w)*.5;
  var winY = (screen.availHeight - h)*.5;
  var scroll = 'no';
  actieplanwindow = window.open(url, name,'width=' + w + ',height=' + h + ',left=' + winX + ',top=' + winY + ',scrollbars=' + scroll);
}

function openDirectContact(lang_id)
{
  // open popup for direct contact form
  openWinCentral('index_contact_form_direct.srf?lang_id='+lang_id, width=320, height=280);
  return;
}

function openWinCentral(url,width,height)
{
	var str = "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	if (window.screen) {
		var ah = screen.availHeight - 30;
		var aw = screen.availWidth - 10;
		var xc = (aw - width) / 2;
		var yc = (ah - height) / 2;
		str += ",left=" + xc + ",screenX=" + xc;
		str += ",top=" + yc + ",screenY=" + yc;
	}
	str += ",scrollbars=no";
	window.open(url, 'window_SS4_popup', str);
	return;
}