function resizeFontSize( param )
{
  if ( !document.body.style.fontSize )
    document.body.style.fontSize = "100.1%";
  
  var fSize = document.body.style.fontSize;

  fSize = fSize.replace(/%/, "");

  if ( param == 1)
    fSize = parseInt(fSize) + 10;
  else if( param == -1)
    fSize = parseInt(fSize) - 10;
  else
    fSize = 100.1;
  
  fSize = fSize + "%";
  
  document.cookie = "font_size=" + fSize + ";path=/";
  
  document.body.style.fontSize = fSize;
}