function open_function(url,width,height,options)
  {
    if ( height > screen.availHeight || width > screen.availWidth) {
      if ( options.indexOf( "scrollbars=") < 0) {
        if ( height > screen.availHeight)
          height = screen.availHeight;
        if ( width > screen.availWidth)
          width = screen.availWidth;
        options += ",scrollbars=yes";
      }
    }
    self.msgWindow = open(url, "Window", "width=" + width + ",height=" + height
      + ",screenX=" + (screen.width-width)/2
      + ",screenY=" + (screen.height-height)/2
      + ",dependent=yes"
      + ",left=" + (screen.width-width)/2
      + ",top=" + (screen.height-height)/2
      + options
      );

    if (self.msgWindow) {
      self.msgWindow.focus();
      if (self.msgWindow.opener == null) self.msgWindow.opener = self;
    }
  }

function get_url (url, k0 ,v0 ,k1 ,v1 ,k2 ,v2 ,k3 ,v3 ,k4 ,v4 ) 
{
  if (k0 && v0) url += "?" + k0 + "=" + escape(v0);
  if (k1 && v1) url += "&" + k1 + "=" + escape(v1);
  if (k2 && v2) url += "&" + k2 + "=" + escape(v2);
  if (k3 && v3) url += "&" + k3 + "=" + escape(v3);
  if (k4 && v4) url += "&" + k4 + "=" + escape(v4);
  return url;
}