var win=null;
function plaatje(mypage,myname,w,h,pos,infocus){
if(pos=="center"){myleft=(screen.width)?(screen.width-w)/2:100;
mytop=(screen.height)?(screen.height-h)/2:100;}
else if((pos!='center' && pos!="random") || pos==null){myleft=0;mytop=20}
settings="width=" + w + ",height=" + h + ",top=" + mytop + ",left=" + myleft + ",scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no";win=window.open(mypage,myname,settings);
win.focus();}