function popup(theURL,winName,features,windowx,windowy,centre) {

  if (centre == "centre") {
	var availx;
	var availy;
    var posx;
    var posy;
	availx = screen.availWidth;
	availy = screen.availHeight;
    posx = (availx - windowx)/2;
    posy = (availy - windowy)/2;
    window.open(theURL,winName,features+',width='+windowx+',height='+windowy+',left='+posx+',top='+posy);
  }

  else {
    window.open(theURL,winName,features,"width="+windowx,"height="+windowy);
  }
  return false;
}

function rise() {
	this.focus();
}