function toggleDisplay(obj,display1,display2){
var open=true;
obj=document.getElementById(obj);
if(obj.style.display == display1)
obj.style.display=display2;
else{
if(obj.style.display1 == display2)
obj.style.display=display3;
else 
obj.style.display=display1;
}
if(open){
open = false;
}
else{
window.scrollBy(0,200);
window.scrollBy(0,-200);
open=true;
}
}

function NieuwVenster(URL)
{
window.open(URL, "foutform", "width=450,height=350,top=40,left=40");
}