var w;

function windowOpen(url, title, params) {
  w = window.open(url, title, params);
}
function popup(url,x,y,target) {
  if (!x || x==0) x=600;
  if (!y || y==0) y=650;
  if (!target) target="_blank";
  if (w && !w.closed) w.close();
  w = window.open( url, target, "width=" + x + ",height=" + y + ",scrollbars=yes,resizable=yes");
}