function OpenNormative()
    {
    lhref = "../normative.html";
    ldescr = "menu";
    var sHeight = screen.availHeight;
    var sWidth  = screen.availWidth;
    var sLeft   = 0;
    var sTop    = 0;

    if ( (sHeight > 300)   ||
         (sWidth  > 400) )
      {
      sHeight = 300;
      sWidth  = 400;
      sHeight -= 50;
      sWidth  -= 10;
      sLeft    = (screen.availWidth -  sWidth)  / 2;
      sTop     = (screen.availHeight - sHeight) / 2;
      }
    else
      {
      sHeight -= 50;
      sWidth  -= 10;
      }

    window.open(lhref,
                ldescr,
                "Width="+sWidth+",Height="+sHeight+",left="+sLeft+",top="+sTop+",status=yes,hotkeys=no,menubar=no,personalbar=no,resizable=yes,toolbar=no,directories=no,location=no");
    }