function abre(URLtoOpen, width, height) { 
  OpenWin = this.open(URLtoOpen, 'sqweed', "toolbar=no, menubar=no ,location=no, scrollbars=no, resizable=no, width=" + width + ", height=" + height + ", top=" + (screen.height/2 - height/2) + ", left=" + (screen.width/2 - width/2) + "\""); 
}