function changein(id) {
        if (document.layers) document.layers[id].visibility = "show"
        else if (document.getElementById) document.getElementById(id).style.visibility = "visible"
        else if (document.all && !(document.getElementById)) document.all(id).style.visibility = "visible"
}
function changeout(id) {
        if (document.layers) document.layers[id].visibility = "hide"
        else if (document.getElementById) document.getElementById(id).style.visibility = "hidden"
        else if (document.all && !(document.getElementById)) document.all(id).style.visibility = "hidden"
}
function nothing(){
}
function retarget()
{	var linkobj = document.links;
	var hnaam = document.location.hostname;
	for (i=0; i < linkobj.length;)
	{	if(linkobj[i].hostname.indexOf(hnaam))
		{	linkobj[i].target ="_blank";
		}
		i++;
	}
}
var alertNL="U moet eerst een zoekopdracht invullen!";
function checkform ()
{
  if (document.forms[0].SearchQuery.value == "") {
alert(alertNL);
    document.forms[0].SearchQuery.focus();
    return false ;
  }
  return true ;
}