// Get browser window dimensions

  var w_display  = .70
  var w_left     = .21
  var w_mid      = .005
  var w_spacer   = .01
  var w_right    = .785
  var w_1_third  = .33
  var w_2_thirds = .67
  var w_half     = .50

  function f_clientWidth() {
          return f_filterResults (
                  window.innerWidth ? window.innerWidth : 0,
                  document.documentElement ? document.documentElement.clientWidth : 0,
                  document.body ? document.body.clientWidth : 0
          );
  }
  function f_clientHeight() {
          return f_filterResults (
                  window.innerHeight ? window.innerHeight : 0,
                  document.documentElement ? document.documentElement.clientHeight : 0,
                  document.body ? document.body.clientHeight : 0
          );
  }
  function f_scrollLeft() {
          return f_filterResults (
                  window.pageXOffset ? window.pageXOffset : 0,
                  document.documentElement ? document.documentElement.scrollLeft : 0,
                  document.body ? document.body.scrollLeft : 0
          );
  }
  function f_scrollTop() {
          return f_filterResults (
                  window.pageYOffset ? window.pageYOffset : 0,
                  document.documentElement ? document.documentElement.scrollTop : 0,
                  document.body ? document.body.scrollTop : 0
          );
  }
  function f_filterResults(n_win, n_docel, n_body) {
          var n_result = n_win ? n_win : 0;
          if (n_docel && (!n_result || (n_result > n_docel)))
                  n_result = n_docel;
          return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
  }