window.onresize = ChangeFont;

var  Rule = new Array;
  Rule[0] = 26;
  Rule[1] = 36;
  Rule[2] = 32;
  Rule[3] = 24;
  Rule[4] = 30;
  Rule[5] = 26;
  Rule[6] = 22;
  Rule[7] = 28;
  Rule[8] = 28;

function ChangeFont() {

  var TheRule= (document.all) ? document.styleSheets[0].rules : document.styleSheets[0].cssRules;
  var OffSet =  (document.all) ? 0 : 1;

  var width = (document.all) ? document.body.clientWidth : window.innerWidth;
  var height = (document.all) ? document.documentElement.clientHeight : window.innerHeight;
  if ( height == 0 ) height = document.body.clientHeight;
  average =  ( ( (width/.75)/1600 ) + ((height/.75)/1200) ) / 2

  for (i=0;i<Rule.length;i++) TheRule[i].style.fontSize = ( Rule[i+OffSet] * average );

}