function popupWin (url,name,x,y,param)
{
  if (!param) {param = "toolbar=0,status=0,location=0,directories=0,menubar=0,scrollbars=1,resizeable=1";}
  if (!x) {x = 640;}
  if (!y) {y = 480;}
  if (x > screen.availWidth) {x = screen.availWidth;}
  if (y > screen.availHeight) {y = screen.availHeight - 40;}
  if (!name) {name = "popup";}
  param += ",width=" + x + ",height=" + y;
  win=window.open(url,name,param);
  win.focus();
}